GB/T 7928-2025General technical specification for metro vehicles (English PDF)

1 Scope

This Document specifies the technical requirements for the use conditions, vehicle types, general requirements, vehicle configuration and train formation, vehicle body and internal equipment, bogies, braking systems, electrical systems, air conditioning and ventilation systems, train control and management systems, communication and passenger information systems, electromagnetic compatibility, safety facilities, interfaces with other disciplines, testing and acceptance, markings, transportation, and warranty periods of metro vehicles.

This Document applies to the design, manufacture, and acceptance of metro vehicles with a maximum operating speed not exceeding 120 km/h.

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.

GB 146.1 Gauge for standard gauge railways - Part 1: rolling stock gauge

GB/T 1402 Railway applications - Supply voltages of traction systems

GB/T 2423.17 Environmental testing - Part 2: Test methods - Test Ka: Salt mist

GB/T 3449 Acoustics - Measurement of noise inside rail-bound vehicles

GB/T 4208 Degrees of protection provided by enclosure (IP code)

GB/T 5068 Axles steel for railway locomotive and wagons

GB/T 5111 Acoustics - Measurement of noise emitted by railbound vehicles

GB/T 10411 DC electric traction systems of urban rail transit

GB/T 11944 Insulating glass unit

GB/T 14894 Rules for inspecting and testing of urban rail transit vehicles after completion of construction

3 Terms and Definitions

For the purposes of this Document, the following terms and definitions apply.

4 Use Conditions

5 Vehicle Types

Vehicles should adopt two main types: Type A and Type B. Their main technical specifications are shown in Table 1.

6 General Requirements

6.1 Vehicle gauge shall comply with the provisions of both CJJ/T 96 and GB 146.1.

6.2 Wheel diameter shall be 840+3 0 mm. For newly manufactured vehicles, the difference in wheel diameter between two wheels on the same axle shall not exceed 1 mm; and the difference in wheel diameter between wheels on the same bogie shall not exceed 2 mm.

6.3 The inner wheel distance shall be 1353 mm ± 2 mm.

6.4 The vehicle mass in its curb weight shall not exceed 3% of the specified value.

6.5 The difference BETWEEN the axle load measured on each driving axle AND the actual average axle load of all driving axles of the same high-speed train shall be within ±2% of the actual average axle load of all driving axles of the train.

6.6 The difference between the actual wheel load of each wheel and the average wheel load of the two wheels on that axle shall be within ±4% of the average wheel load of the two wheels on that axle.

6.7 The height of the passenger compartment floor from the rail surface shall be coordinated with the station platform surface. The empty-loaded car height adjustment device shall ensure that the vehicle floor height does not change significantly due to changes in passenger capacity.

The height difference between the vehicle floor and the station platform surface shall comply with the provisions of GB 55033.

6.8 The train shall be able to safely pass through minimum radius curve sections at the specified speed and perform normal coupling and uncoupling operations on the specified small radius curves.

6.9 The traction-speed characteristics and braking-speed characteristics of the train shall meet the design requirements.

6.10 The maximum test speed of the train shall be 1.1 times the maximum operating speed or plus 10 km/h, whichever is greater. The maximum operating speed should select as 80 km/h, 100 km/h, or 120 km/h.

6.11 When the train is in a maximum capacity condition, on a straight and dry track, with wheels in a semi-worn state, and at the rated power supply voltage, the average acceleration of the train at startup shall meet the following requirements:

a) When the maximum operating speed is 80 km/h, the average acceleration of the train from 0 to 40 km/h shall be no less than 1.0 m/s²; and when the motor-to-trailer ratio is 1.1, it shall be no less than 0.83 m/s²; the average acceleration of the train from 0 to 80 km/h shall be no less than 0.6 m/s²; and when the motor-to-trailer ratio is 1.1, it shall be no less than 0.5 m/s².

b) When the maximum operating speed is 100 km/h, the average acceleration of the train from 0 to 45 km/h shall be no less than 1.0 m/s²; the average acceleration of the train from 0 to 100 km/h shall be no less than 0.6 m/s².

c) When the maximum operating speed is 120 km/h, the average acceleration of the train from 0 to 50 km/h shall be no less than 1.0 m/s²; the average acceleration of the train from 0 to 120 km/h shall be no less than 0.5 m/s².

6.12 When the train is overcapacity, on a straight and dry track, and with wheels in a semi-worn state, the average deceleration during braking from maximum operating speed to a stop shall meet the following requirements:

a) The average deceleration during normal braking shall be no less than 1.0 m/s²;

b) The average deceleration during emergency braking shall be no less than 1.2 m/s².

6.13 Except for emergency braking, the longitudinal impact rate of the train during traction or braking shall not exceed 0.75 m/s³.

6.14 The impact and vibration tests of various equipment on the vehicle shall comply with the provisions of GB/T 21563.

6.15 The stability index of the vehicle operating on newly built metro lines shall be less than 2.5; and the derailment coefficient shall be less than 0.8.

6.16 The noise test methods and track conditions in the driver's cab and passenger compartment shall be implemented in accordance with the provisions of GB/T 3449; and the permissible noise limits in the driver's cab and passenger compartment shall comply with the provisions of Table 2. […]