Circular No. 24/2015/TT-BGTVT Issuing National Technical Regulations on Railway Rolling Stock Switching Devices - Technical Requirements

CIRCULAR

Issued Article 24Technical Regulation on railway transport vehicles on railways -
GCoupler price - Turning frame YTechnical requirementsorganize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.

________________________

Pursuant to the Law on Railways dated June 14, 2005;

Pursuant to the Law on Standards and Technical Regulations dated June 29, 2006;

Pursuant to the Decree No. 127/2007/NĐ-CP dated August 1, 2007 of the Government detailing implementation of certain provisions of the Law on Standards and Technical Regulations;rime Minister cn technical;

CamendPursuant to Decree No. 164No. Pursuant to the Decree No. 107/2012/NĐ-CP dated December 20, 2012 of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Transport;

Pursuant to the proposal of the Director of the Department of Ethnic Affairs and Religion Propaganda;on the opinions of the Director of the Science and Technology Department and the Director of the Registration Agency;developmenthereby,

The Minister of Transport issues this Circular on the Technical Regulation on railway transport vehicles - Coupler price - Turning frame - Technical requirements.

Article 1. This Circular promulgates the Technical Regulation on railway transport vehicles - Coupler price - Turning frame - Technical requirements.

Registration code: QCVN 87:2015/BGTVT.

Article 2. This Circular takes effect from January 1, 2016 and revokes Decision No. 53/2006/QĐ-BGTVT dated December 29, 2006 of the Minister of Transport promulgating Industry Standard 22 TCN 359-06 "Railway transport vehicles - Coupler price for passenger cars - Technical requirements for production and new assembly".

Article 3. The Head of the Ministry's Office, the Inspector General, Heads of Departments, Directors of the Registration Agency, Directors of the Vietnam Railway Administration, Chairman of the Board of Directors of Vietnam Railway Corporation, Heads of agencies, organizations, and individuals related shall be responsible for implementing this Circular./.

QCVN 87:2015/BGTVT

AMENDMENT 1:2025 QCVN 07:2023/BXD

ON RAILWAY TRANSPORT VEHICLES –

COUPLER PRICE - TECHNICAL REQUIREMENTS

National technical regulation on railon Month Day Yearway vehicles - Railway car's bogies - Technical requirementsQCVN 87:2015/BGTVT compiled by the Registration Agency, submitted for review by the Science and Technology Department, examined by the Ministry of Science and Technology, and issued by the Minister of Transport pursuant to Circular No.

Foreword

/2015/TT-BGTVT dateddevelopmentThis regulation is based on Industry Standard number 22 TCN 359-06 promulgated together with Decision No. 53/2006/QĐ-BGTVT dated December 29, 2006 of the Minister of Transport.ưởGeneral provisions Technical regulations 24Requirements for structure and materials 16 the 6 year 2015.

Inspection regulationsưởDocumentation regulations 

2.4.4. Support for Multi PLP

1. Management regulations

1.1. Scope of application

1.2. Applicability

1.3. Definitions

2. Appendix 1: Steel grade for coupler frame, coupler side plates, and spring beams

2.1. General Requirements

2.2. Appendix 2: Wheel tread shape and dimensions

3. Appendix 3: Static load test parameters for coupler price

3.1. This regulation specifies technical requirements and inspection criteria for type 2-axle coupler prices produced, assembled, and imported for use on railway cars operating on national railway networks and dedicated railways connected to the national network.

3.2. Inspection Content

4. This regulation applies to organizations and individuals involved in designing, producing, assembling, importing, inspecting, issuing certificates of quality, safety, and environmental protection for type 2-axle coupler prices used on railway cars (hereinafter referred to as coupler prices).

5. Implementation

Design speed

is the maximum operational speed according to design limited by safety conditions and structural durability that the railway car can operate stably continuously.

Braking distance

AMENDMENT 1:2025 QCVN 07:2023/BXD

ON RAILWAY TRANSPORT VEHICLES –

COUPLER PRICE - TECHNICAL REQUIREMENTS

National technical regulation on railon Month Day Yearway vehicles - Railway car's bogies - Technical requirementsQCVN 87:2015/BGTVT compiled by the Registration Agency, submitted for review by the Science and Technology Department, examined by the Ministry of Science and Technology, and issued by the Minister of Transport pursuant to Circular No.

1. Management regulations

1.1. Scope of application

is the distance traveled by the train during braking time.developmentBraking ratiois the ratio between the theoretical total brake shoe pressure and the thrust force of the brake cylinder piston when the braking efficiency is 100%. Axle spacingn is the distance between two longitudinal axle centerlines within the same coupler price.organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. a) National vocational skill certificate Level I;

1.2. Applicability

Wheel gauge is the inner distance between two wheel flanges or rims within the same axle set.Coupler side plate

1.3. Definitions

In this regulation, the following terms are understood as follows:

1.3.1. is the basic component located on both sides of the coupler price, used to connect with the axle housing and transmit forces within the coupler price. Spring beam

1.3.2. is the part connecting to the coupler price frame or coupler side plate through a spring mechanism, directly bearing the weight of the car body. lCoupler price frame

1.3.3. is the basic component linking the axle housings, simultaneously transmitting forces within the coupler price. Friction damper

1.3.4. is a damper using friction resistance or force generated in relative motion of friction surfaces. Slide table

1.3.5. is the part used to control the tilt of the car body when the railway car operates. For railway cars with load-bearing slide tables, this part supports the car body and transmits the car body weight to the coupler price. Axle set

1.3.6. is the unit composed of two wheels and one axle. Wheel tread

1.3.7. is the contact surface of the wheel with the top of the rail. Axle load

1.3.8. is the maximum permissible load capacity of the axle. Axle housingdevelopment is the part installed at the axle of the axle set, equipped with ball bearings and lubrication mechanisms to transmit loads and limit axial and lateral movement of the axle set.

1.3.9. Coupler prices produced, assembled, and imported must comply with the provisions of this regulation and the design drawings (hereinafter referred to as designs) reviewed by the Registration Agency. Operating environment Coupler prices must operate stably and normally in the operating environment with temperatures ranging from -10°C.

1.3.10. Outline dimensions The outline dimensions of the coupler price must not exceed the vehicle width limits defined in QCVN 08:2011/BGTVT.No.Design speed of the coupler price must comply with the following regulations: Design speed of the coupler price for passenger cars: not exceeding 120 km/h for 1000 mm gauge cars and not exceeding 160 km/h for 1435 mm gauge cars.

1.3.11. Design speed of the coupler price for freight cars: not exceeding 100 km/h for 1000 mm gauge cars and not exceeding 140 km/h for 1435 mm gauge cars. Braking distance

1.3.12. The braking distance must ensure it does not exceed 800 meters. During braking, the wheels must not skid. Braking ratio of the coupler price must comply with the design specifications.

1.3.13. Minimum radius of curvature R for the coupler price must be 97 meters on main lines and 75 meters on branch lines for 1000 mm gauge.

1.3.14. 145 meters on main lines and 100 meters on branch lines for 1435 mm gauge. Components and parts of the same type of coupler price must have interchangeability to facilitate maintenance and repair processes., amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CP The operational performance of the coupler price must meet the dynamic performance indicators specified in QCVN 18:2011/BGTVT.

2. Appendix 1: Steel grade for coupler frame, coupler side plates, and spring beams

2.1. General Requirements

The redirecting price must comply with the provisions of this Standard and the design documentation (hereinafter referred to as the design) approved by the Vietnam Registration Agency.developmentEnvironmental application

2.1.1. The redirecting price must operate stably and normally in the environmental application at temperatures from -10

Outline dimensions limit The outline dimensions of the redirecting price shall not exceed the width limits of the carriage body as specified in QCVN 08:2011/BGTVT. ^°C to 50 ^°C.

2.1.2. Construction speed of the redirecting price must comply with the following regulations:

Construction speed of the redirecting price for passenger carriages: not exceeding 120 km/h for carriages with a track gauge of 1000 mm and not more than 160 km/h for carriages with a track gauge of 1435 mm.ớConstruction speed of the redirecting price for freight carriages: not exceeding 100 km/h for carriages with a track gauge of 1000 mm and not more than 140 km/h for carriages with a track gauge of 1435 mm.u Braking distance

2.1.3. is the basic component located on both sides of the coupler price, used to connect with the axle housing and transmit forces within the coupler price.

The braking distance must ensure that it does not exceed 800 m. During braking, wheel skidding shall not occur.

2.1.3.1. The braking ratio of the redirecting price must be in accordance with the design specifications.June 2024; Minimum radius of curvature R through which the redirecting price must pass:

2.1.3.2. 97 m on the main line and 75 m on the branch line for a track gauge of 1000 mm.June 2024; 145 m on the main line and 100 m on the branch line for a track gauge of 1435 mm.

2.1.4. Compatibility of detail clusters and parts of the redirecting price of the same type must facilitate maintenance and repair processes.

The operational performance of the redirecting price must meet the dynamic performance criteria specified in QCVN 18:2011/BGTVT.

2.1.5. Shock absorbers, oil dampers;

2.1.6. Defect inspection reports and material testing certificates for the frame, guide shoes, axle, and wheels;_{Maximum Downhill Gradient} Quality certificates for the parts: frame, guide shoes, axle, and wheels° is stipulated as follows:

a) d) Static load test report of the redirecting price.g After production, assembly, and importation, the redirecting price must undergo quality inspection. The results of the inspection must comply with the design specifications and this Standard.

b) WheelNo.Diameter of the rolling wheel:

2.1.7. Not less than 838 mm for the redirecting price of passenger carriages using air springs, disc brakes;

2.1.8. Not less than 780 mm for other types of carriages.

2.1.9. The main load-bearing parts (transfer girder frame, spring beam, side frame, axle box, spring) must be designed to ensure durability requirements that meet current standards and technical regulations.

2.1.10. The service life of the transfer girderpolicies shall not be less than 30 years.

2.2. Appendix 2: Wheel tread shape and dimensions

2.2.1. Materials

a) For steel cast transfer girder frames, side frames, and spring beams, they must be made of grade B steel or grade C according to Standard AAR M-201-92: Cast steel or equivalent cast steel. The chemical composition and mechanical properties of grade B or grade C as specified in Appendix 1 of this Technical Regulation.

b) For steel welded transfer girder frames, side frames, and spring beams, the minimum requirement is SM 490 A steel according to standard JIS G3106: Steel for welding or equivalent steel. The chemical composition and mechanical properties of steel plates as specified in Appendix 1 of this Technical Regulation.of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home AffairsCertificates of chemical composition and mechanical properties of cast steel or steel plates manufacturing transfer girder frames, side frames, and spring beams must be issued by authorized agencies or organizations.

c) Use roller bearing axle boxes. The type

2.2.2. Design speed of the coupler price for freight cars: not exceeding 100 km/h for 1000 mm gauge cars and not exceeding 140 km/h for 1435 mm gauge cars.

a) of rollers, shaft neck size, and shaft load must comply with design specifications or current standards and technical regulations. , amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CP Materials for manufacturing shafts and wheels must conform to design specifications or current standards and technical regulations. The shafts must be manufactured using forging or rolling technology, while wheels must be manufactured using continuous rolling or casting technology.

b) The type and size of the axle box must comply with design specifications or current standards and technical regulations.

c) The maximum preload force and maximum pressing force when installing wheels on the axle box must comply with design specifications or current standards and technical regulations.

d) For track gauge 1000 mm

2.2.3. is a damper using friction resistance or force generated in relative motion of friction surfaces.

2.2.3.1. Axle spacing from 1980 mm to 2600 mm

a) for passenger car transfer girders;No.Axle spacing from 1600 mm to 1750 mm

b) for freight car transfer girders.No.For track gauge 1435 mm

2.2.3.2. Axle spacing from 2400 mm

a) to 2600 mm for passenger car transfer girders;policiesAxle spacing from 1600 mm to 1750 mm for freight car transfer girders.

b) In cases where the axle spacing of passenger car transfer girders exceeds 2600 mm and the axle spacing of freight car transfer girders exceeds 1750 mm,

2.2.3.3. Independence - freedom - happinessNo.the design calculation description must include testingorganize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. axle spacing requirements.developmentThe tread profile and nominal dimensions of the wheel must comply with the provisions set out in Appendix 2 of this Technical Regulation or design specifications.in accordance with Spring and shock absorber system for Spring system

2.2.4. Passenger car transfer girders must use a two-spring structure: box spring and central spring;h Freight car transfer girders must use a structure with at least one central spring or box spring;policies.

2.2.5. The total static vertical deflection of the spring system must comply with design specifications;

2.2.5.1. Materials for manufacturing springs and the hardness of box springs and central springs of transfer girders must comply with design specifications.

a) Passenger car transfer girders||| Must use hydraulic shock absorbers or other types at the suspension part of the central spring system. The damping coefficient of the shock absorber must comply with design specifications;

b) Freight car transfer girdersg Must use friction shock absorbers. Material requirements and friction coefficients of shock absorbers must comply with design specifications; material and specifications of shock absorber springs must comply with design specifications.

c) Transfer girder frame, side frame, and spring beama Transfer girder

d) frame, side frame, and spring beam must meet the following requirements:

2.2.5.2. Shock absorber

a) Made of cast steel or welded steel;

After casting or welding, side frames and spring beams must undergo heat treatment to eliminate residual stress and surface treatment by shot blasting or other surface treatment methods;

b) Internal defect inspection of castings (for transfer girderướframes, side frames, and spring beams made of cast steel) and weld inspection at positions specified in the design must be carried out; defect levels must not exceed allowable limits set by the design and current standards and technical regulations;

Dimensional tolerances of transfer girder frames, side frames, and spring beams after manufacture must not exceed tolerances specified in the design.

2.2.6. The structure of the transfer girder frame and components of the transfer girder must facilitate inspection and maintenance.

Passenger car transfer girders must have a mechanism to position the spring beam and box spring vertically and horizontally along the transfer girder frame.ANNEX I.A[31]The power transmission mechanism of the brake lever must ensure durability, reliable operation, and adjustability when the wheel rolling diameter and brake shoe thickness change within permissible limits.

a) For parts that come into contact, impact, or relative motion during operation, wear-resistant materials must be used and measures taken to reduce impact.

b) Transfer girders must have safety mechanisms such as chains and supports to prevent damage to parts like brake levers, spring beams, and spring supports during operation.

c) The structure of the transfer girder must allow adjustment of the height of the coupling support point of the car body.No.Welding rods and welding wires used in the manufacture of transfer girdersANNEX I.A[31]must ensure that the mechanical properties of the welds are not lower than those of the base metal.

d) Rubber products and other non-metallic materials must comply with design specifications and current standards and technical regulations.

2.2.7. Documentation for transfer girders includes:

2.2.8. Inspection result records of dimensions;developmentTest result records of the performance of

2.2.9. springs, hydraulic shock absorbers;, amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPReports on defect inspections and material test certificates

2.2.10. for transfer girder frames, side frames, axles, and wheels; Quality certificates for parts: transfer girder frames, side frames, axles, and wheels

2.2.11. e) Static load test records of transfer girders.

2.2.12. Transfer girders after production, assembly, and import must be inspected for quality. Inspection results must comply with design specifications and this Technical Regulation.

2.2.13. Wheels Rolling circle diameter of the wheel:

2.2.14. Not less than 838 mm for passenger car transfer girders using air springs and disc brakes;y Not less than 780 mm for other types of cars.policies Deviation of the rolling circle diameter of two wheels on the same axle:

3. Appendix 3: Static load test parameters for coupler price

3.1. This regulation specifies technical requirements and inspection criteria for type 2-axle coupler prices produced, assembled, and imported for use on railway cars operating on national railway networks and dedicated railways connected to the national network.

Not more than 1 mm for transfer girders with a construction speed of less than 120 km/h;

a) Not more than 0.5 mm for transfer girders with a construction speed of 120 km/h or more.

b) The difference in the rolling circle diameter of two wheels on the same axle shall not exceed 1 mm. lDeviation of the diameter of the rolling wheel of two wheels on the same axle:

c) Not exceeding 1 mm for the redirecting price with a construction speed of less than 120 km/h;° Not exceeding 0.5 mm for the redirecting price with a construction speed of 120 km/h or more.

d) The difference in the diameter of the rolling wheel of two wheels on the same axle shall not exceed 1 mm. lDeviation of the diameter of the rolling wheel of two wheels on the same axle:

For the axle of the wheel with a track gauge of 1000 mm;

3.2. Inspection Content

Rust protection and surface coating with at least one layer of paint, except for details specifically provided for in the design. The surface of cast steel parts, rims, and the middle shaft between two wheels must be coated with a non-colored glossy paint layer;organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. Technical requirements for rust-proof paint and surface coating must comply with current technical standards and regulations.

3.2.1. During the production and assembly of the redirecting price, electrical current shall not be allowed to pass through the bearing raceway.

3.2.1.1. On the frame, guide shoes, and spring beams, there must be letters or labels indicating the type of redirecting price, manufacturing facility, year and month of production, and other requirements if specified in the design.

a) Static load testdevelopmentAfter complete assembly, the redirecting price must undergo a static load test on specialized equipment. The content of the test is regulated in Appendix 3 of this Standard and the test load must comply with the design specifications.

b) The results of the static load test must comply with the design specifications.No.When leaving the factory, the redirecting price must have a quality certificate including the following contents:

3.2.1.2. Name of the manufacturing plant;

a) Name and type of the redirecting price;

b) Type of wheel axle; Serial number;

3.2.1.3. d) Month and year of factory release;

3.2.1.4. The clearance between the tire tread surface and the standard profile of the tread surface (as specified in Appendix 2 of this Standard) shall not exceed 0.5 mm.

3.2.2. Axle

a) The chemical composition and mechanical property certificates of the axle material must comply with the design requirements;

b) The size of the axle must conform to the design specifications;

c) The axle must meetshall Inspection result certificate for defects.

3.2.3. Wheel load diagram

The wheel load diagram and the maximum load pressure must comply with the design specifications or current technical standards and regulations.

3.2.4. is the part used to control the tilt of the car body when the railway car operates. For railway cars with load-bearing slide tables, this part supports the car body and transmits the car body weight to the coupler price.

The track gauge of the wheels must satisfy the following provisions:

a) 924 ±1 mm in relation to the axle of a 1000 mm gauge track;No.Symbol of applicable standards and regulations.

b) 1353 ±1 mm for the axle of a 1435 mm gauge track;

c) The deviation of the track gauge measurement at three equally spaced points must not exceedANNEX I.A[31] 1 mm. assembly of the wheel rolling and the installation of the rolling bearing on the axle must comply with the design specifications or current technical standards and regulations.

3.2.5. Type , amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CP Distance from the center of the axle housing to the frame support, guide bracket

3.2.6. The vertical and horizontal distance deviation of the axle housing center from the frame support, guide bracket must not exceed 2 mm;

a) The diagonal distance deviation of the axle housing center from the frame support must not exceed 3 mm. The total clearance between the sliding frame oil housing and the spring frame slider along the vehicle's vertical direction and the axle's vertical direction must comply with the design specifications; for the type of steering gear with a shock absorber, the friction surface must not have any clearance.

b) The total lateral clearance between the two ends of the brake rail slider and the circular rail edge of the guide bracket must not be less than 20 mm, and the upper clearance of the brake rail with the bottom of the rail slide must not be less than 4 mm.

3.2.7. The total gap or looseness between the spring frame and the frame support must comply with the design specifications; the vertical tilt of the spring frame relative to the frame support must not exceed 2 mm, and the vertical tilt relative to the axle must not exceed 4 mm. Iforganize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. the central pivot is

3.2.8. a non-friction pivotg or rubber, the tilt of the spring frame must comply with the design specifications;The length deviation of the control rod working stroke of the spring frame vertically relative to the frame support must not exceed 2 mm. Free state

3.2.9. is the contact surface of the wheel with the top of the rail.

a) The height difference of the round springs on the same steering gear must not exceed 3 mm;y The height difference between the inner and outer springs of the same spring set must not exceed the design specifications;

b) The height deviation of the central spring on a steering gear must not exceed the design specifications.on State under the weight of the vehicle body lAll springs must be in a loaded state; lThe height difference between the springs must not exceed the design specifications;"b) In addition to the lists of public services issued according to the provisions of Clause 2, Article 4 of this Decree, specialized agencies under provincial People's Committees shall report to the provincial People's Committee for decision-making on amending, supplementing, or issuing the list of public services funded by the state budget within their jurisdiction and consistent with the local budget capacity within the approved budget by the Provincial People's Assembly, and send it to the Ministry of Finance and relevant ministries and sectors for supervision during implementation." The clearance between the inner and outer rings of the round spring from 2.5 mm to 4 mm;

c) The inner and outer springs at the same position must have different winding directions;

3.2.10. Materials for manufacturing springs and the hardness of box springs and central springs of transfer girders must comply with design specifications.

3.2.10.1. For steel central springs, the vertical tilt of the spring frame relative to the frame support must not exceed 2 mm, and the vertical tilt relative to the axle must not exceed

a) mm; for air or rubber central springs, the tilt of the spring frame must not exceed the design specifications.g Structure

b) Brake retainer mechanism

c) After assembly, the brake retainer mechanism of the steering gear must operate stably and flexibly. The distance from the brake retainer mechanism to other parts of the steering gear when in the braking and releasing states must comply with the design specifications;

3.2.10.2. When installed in a vertical or inclined position, the brake retainer mechanism must be installed from top to bottom; except in cases where the structure cannot meet the above requirement, it must be installed according to the design specifications;

a) The excess length of the safety chain of the brake retainer mechanism must be within the range of 30 mm to 50 mm. When in the braking or releasing state, the clearance between the lower surface of the brake shoe and the safety chain must be from 10 mm to 30 mm;

b) In the released state, the clearance between the brake shoe pad and the wheel tread surface or between the brake shoe and the brake disc must be uniform and comply with the design specifications.

c) Between the surfaces subject to friction of the steering gear, there must be a layer of lubricating oil or grease (except for the dry friction shock absorber surfaces). In the case of a load-bearing surface, the lubrication method must comply with the design specifications. Protective coating

d) The components and parts of the steering gear must be coated with anti-corrosion paint and at least one layer of surface paint, except for parts with specific requirements in the design. The surface of the cast steel parts, rims, and the middle shaft between two wheels must be coated with a colorless glossy paint.

The requirements for the anti-corrosion paint and surface paint must comply with current technical standards and regulations. During the production and assembly of the steering gear, electrical current must not pass through the axle bearing. 4 On the frame, guide bracket, and spring frame, there must be letters or labels indicating the type of steering gear, the manufacturing facility, the month and year of production, and other requirements if specified in the design.

3.2.11. Static load test After complete assembly, the steering gear must undergo a static load test on dedicated equipment. The test content is specified in Appendix 3 of this Standard, and the test load must comply with the design specifications.

a) The results of the static load test must comply with the design specifications.organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. The steering gear must have a quality certificate upon shipment, including the following contents:

b) Name of the manufacturing plant;

c) Name and type of steering gear; ÷ Type of wheel axle; ÷ Serial number;

Month and year of shipment; Symbol of applicable standards and regulations. Testing requirements for steering gears produced, assembled, and imported for the first time:

3.2.12. For steering gears produced and assembled: before putting the steering gear into mass production, the first product must be installed on a train car for a minimum of 100,000 km trial operation, followed by re-inspection and evaluation before mass production and assembly. The trial operation conditions must be equivalent to the actual operational conditions.shall For imported steering gears: before putting imported steering gears into use, the first batch of products must be installed on a train car for a minimum of 100,000 km trial operation. The trial operation conditions must be equivalent to the actual operational conditions.n lResponsibilities of the steering gear production and assembly facilities:organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. Adhering to current technical standards and regulations;

3.2.13. Establishing technological processes, testing procedures, organizing quality inspections for each product, and being responsible for the products shipped out;

a) Being responsible for the origin, shipment, and quality of materials and spare parts produced domestically or imported during production and assembly.No.Testing requirements for the redirecting price produced, assembled, and imported according to the design:organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular. First time:

b) For the redirecting price produced and assembled: before putting the redirecting price into mass production, the first product must be installed on a carriage for a minimum of 100,000 km of trial operation, then re-inspected and evaluated before mass production and assembly. The trial operation conditions must be equivalent to the actual operating conditions. For the imported redirecting price: before putting the imported redirecting price into use, the first batch of products must be installed on a carriage for a minimum of 100,000 km of trial operation. The trial operation conditions must be equivalent to the actual operating conditions.

3.2.14. Responsibilities of the production and assembly facilities of the redirecting price:

3.2.15. Adhering to current technical standards and regulations;No. Establishing technological processes, testing procedures, organizing quality inspections for each product, and being responsible for the products leaving the factory;policies set forth.

3.2.16. Being responsible for the origin, quality of domestically produced or imported materials and spare parts when producing and assembling the redirecting price.

Circular No. 36/2011/TT-BGTVT dated May 6, 2011, issued by the Minister of Transport. In cases where the standards and regulations cited in this Standard are amended, the Vietnam Registration Agency shall be responsible for organizing the dissemination. Distance from the bottom of the guide shoe to the rail surface, [mm]

From the top of the lower guide to the rail surface, [mm]

3.3. Static load values P1, P2 must comply with the design specifications.

a) Dimensions of the load-bearing part must be within the permissible range of the design.

b) Evaluating the inspection results

c) The inspection parameters of the redirecting price must comply with the design specifications.

d) Number of production;

d) Month, year of factory release;

e) Symbol of applicable standards and technical regulations.

4. This regulation applies to organizations and individuals involved in designing, producing, assembling, importing, inspecting, issuing certificates of quality, safety, and environmental protection for type 2-axle coupler prices used on railway cars (hereinafter referred to as coupler prices).

4.1. Provisions on testing for steering gears produced, assembled and imported for the first time: nhập khẩu theo thipoliciesb) The list of equipment for preventing unauthorized access through the Internet network, including at least the following information: name of equipment, configuration, year of production, manufacturer, country of production, quantity, quality (new/used), installation location, management/staff operating, function/feature usage;policies First time:

a) For steering gears produced, assembled: before putting the steering gear into mass production, the first product must be installed on a carriage for trial operation with a minimum distance of 100,000 km, then it must be re-inspected and evaluated before mass production and assembly can commence. The test conditions must be equivalent to the actual operating conditions.development chạy thử nghiệm vận dụng tối thiểu 100 000 km, sau đó phải được kiểm tra, đánh giá lại trước khi sản xuất, lắp ráp hàng loạt. Điều kiện thử nghiệm vận dụng phải tương đương với điều kiện vận dụng chính thức.

b) For imported steering gears: before putting imported steering gears into use, the first batch of products must be installed on a carriage for trial operation with a minimum distance of 100,000 km. The test conditions must be equivalent to the actual operating conditions.

4.2. Responsibilities of the steering gear production and assembly facility:

a) Adhering to current technical standards and regulations;

b) Establishing production processes, testing procedures, organizing quality inspections for each product, and being responsible for the products released from the factory;

c) Being responsible for the origin, quality of domestically produced or imported materials and spare parts when producing and assemblingứ, chất lượng vật liệu, phụ tùng được sản xuất trong nước hoặc nhập khẩu khi sản xuất, lắp ráp.

4.3. Responsibilities of facilities redirected import price:

a) Adhering to current technical standards and regulations;

b) Be responsible for origin, place of production, quality lof redirected import pricedevelopmentimported steering gears

4.4. The redirected import price must have a Quality Safety Technical and Environmental Protection Certificate issued by the Vietnam Registration Agency before being put into use.developmentissued by the Ministry of Transport of Vietnam.

4.5. The application dossier for design review, procedures for issuing the Design Review Certificate, inspection procedures, and issuance of the Quality Safety Technical and Environmental Protection Certificate for redirected car bogie prices shall be carried out in accordance with Circular No. 02/2009/TT-BGTVT dated April 3, 2009, and Circular No. 36/2011/TT-BGTVT dated May 6, 2011 of the Minister of Transport. In cases where standards and regulations cited in this Standard are amended, supplemented, or replaced, they shall be applied according to new documents.No. Circular No. 36/2011/TT-BGTVT dated May 6, 2011, of the Minister of Transport. In cases where the technical standards and legal provisions cited in this Standard have been amended,, amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPThe Vietnam Registration Agency is responsible for organizing the implementation, guiding the inspection and issuance of Quality Safety Technical and Environmental Protection Certificates for redirected car bogie prices produced, assembled, and imported in accordance with this Standard, and proposing amendments and supplements to this Standard when necessary.

5. Implementation

The Vietnam Vehicle Inspection Agency shall be responsible for organizing the implementation.developmentSTEEL GRADE FOR FRAME AND ROLLER BEARING

ANNEX 1

Grade B

1. Chemical composition

1.1. ≤ 0,32%, Mn ≤ 0,90%, Si ≤ 1,5%,

C Other alloying elements may be added "5. The pre-tax weighted average cost of capital i (%) is determined according to the formula below: ≤ 0,040%, Provincial People's Committees set specific prices ≤ 0,040%

At the maximum carbon content, each time it decreases by 0,01%. , the maximum Mn content allowed can increase by 0,04% but not exceeding 1,20%.THE Mechanical properties C≥ 485 MPa, ≥ 260 MPa, ≥ 36 %, hardness: 137

1.2. 208 HB, A

s_ầu kv s_s J For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;₄ ≥ 24%, y (-7°C) ÷ Grade_{≤ 0,32 %, Mn ≤ 1,85 %, Si ≤ 1,50 %,} ≥ 20≤ 0,04 %, other alloying elements may be added. After heat treatment: Quenching + Tempering

2. ≥ 620 MPa, C

2.1. ≤ 0,32%, Mn ≤ 0,90%, Si ≤ 1,5%,

C 415 MPa, "5. The pre-tax weighted average cost of capital i (%) is determined according to the formula below: ≤ 0,04 %, Provincial People's Committees set specific prices ≥ 45 %, hardness: 179

2.2. 208 HB, A

Terrestrial Mobile Radio Equipment with Detachable Antennas Used for Analog Voice Communication 241 HB, A

s_ầu > 20 J s_s ≥ 18°C). For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;₄ ≥ 22 %, y After heat treatment: Annealing ÷ 620 MPa,_{≤ 0,32 %, Mn ≤ 1,85 %, Si ≤ 1,50 %,}> 45 %, hardness: 179 (-J (

(b) 40°C). + Deputy ministers of ministerial-level agencies,

s_ầu­ ≥ Steel grade 490 A according to JIS 3106 standard s_s ≥ 18°C). For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;₄ ≥ 22 %, y Chemical composition: ÷ 620 MPa,_{≤ 0,32 %, Mn ≤ 1,85 %, Si ≤ 1,50 %,} > 34 ≤ 0,2%, Mn ≤ 1,6%, Si ≤ 0,55%,-Mechanical properties:

3. 610 MPa

3.1. SHAPE AND SIZE OF WHEEL ROLLING SURFACE

C Wheel rolling surface for track gauge 1435 mm: "5. The pre-tax weighted average cost of capital i (%) is determined according to the formula below: ≤ 0,035%, Provincial People's Committees set specific prices ≤ 0,035%

3.2. Figure 1 - Shape of wheel rolling surface for track gauge 1435 mm

s_ầu: 490 ÷ Wheel rolling surface for track gauge 1000 mm:

ANNEX 2

Figure 2 - Shape of wheel rolling surface for track gauge 1000 mm

1. ANNEX 3

SPECIFICATIONS FOR TESTING REDIRECTED PRICE UNDER STATIC LOAD

2. Requirements for testing equipment:

Testing the redirected price under static load must be conducted on a dedicated test bench, with the load measurement error of the equipment not exceeding 2%.

The weight display meter must be within the calibration period.

Test results [mm]

1. No load

- Load P1

- Load P2ANNEX I.A[31] Spring height / shaft housing, [mm] organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.Distance from top of spring to bottom of roller bearing, [mm]

2. Inspection Content

2.1. Inspection parameters

- Static load values P1, P2 must comply with the design specifications.policies;

- Size of theANNEX I.A[31] load-bearing part must be within the permissible range of the design.

2.2. Evaluation of inspection results

Requirements for steering gear inspection parameters must conform to the design specifications.