GB/T 25021-2026Railway heavy-duty maintenance machinery - Track inspection cars (English PDF)

6.1 Mechanical interface device

6.1.1 The strength design shall comply with the relevant provisions of TB/T 3548.

6.1.2 The test beam should have functions such as vibration reduction and height adjustment.

6.1.3 External mechanical interface devices and their installation should adopt an anti-loosening design.

6.2 Electrical interface device

6.2.1 The power supply provided by the vehicle to the detection system should be AC220V±AC22V or AC380V±AC38V, with a frequency of 50Hz or 60Hz.

6.2.2 The power supply capacity shall be configured according to the power requirements of the vehicle-mounted detection system and shall be greater than the total rated power of the vehicle-mounted detection system.

6.2.3 The power supply device shall take electrical isolation and voltage stabilization measures, and the power supply harmonic content shall be less than or equal to 5%.

7.1 Basic Requirements

7.1.1 The shock and vibration performance of the equipment shall comply with the provisions of GB/T 21563.

7.1.2 The electromagnetic compatibility performance of the equipment shall comply with the requirements of GB/T 24338.4.

7.1.3 The protection level of external equipment should not be lower than IP65.

7.1.4 The cabling shall comply with the provisions of GB/T 34571.

7.1.5 It should meet the requirement of continuous normal operation for 4000km or 48h.

7.1.6 An uninterruptible power supply (UPS) shall be installed to provide emergency power for the vehicle-mounted detection system for a normal working time of not less than 30 minutes.

7.1.7 It should have bidirectional detection capabilities to collect and process data in real time.

7.1.8 It should have the function of automatically and manually correcting mileage information, and the detection parameters of each detection system should be synchronized in terms of mileage.

7.1.9 It should have the functions of statistical analysis, deviation judgment and output of test reports for test parameters.

7.1.10 Test data should be transferable.

7.2 Orbit Geometry

7.2.1 Technical Specifications The track geometry specifications should meet the requirements of Table 1.

7.2.2 Functional Requirements

7.2.2.1 Basic testing information should be input manually or automatically, including the name of the testing equipment, the model of the testing system, the line name, the row type, and the addition/reduction information. This includes information such as mileage reduction, inspection direction, and time. The inspection data should include basic inspection information.

7.2.2.2 Track geometry parameters should be output at 250mm intervals.

7.2.2.3 It should have the function of setting test standards in segments and automatically make judgments based on the judgment limits.

7.2.2.4 It should have the function of confirming and marking invalid track geometric deviation data.

7.2.2.5 It should have the function of storing raw sensor data, track geometric parameters, and deviation data, among which the storage capacity for track geometric parameters is not... Less than 100,000 km.

7.2.2.6 Track geometric deviation data shall be stored and managed using a database.

7.2.2.7 Track geometric deviations shall be output in the specified format, and the deviation information shall include mileage position, peak value, length, and alignment (circular/gradient/...). (Straight), passing speed and inspection standards, etc.

7.2.2.8 The waveform of the track geometry detection data should be displayed in real time, and it should have the functions of playback and comparison with historical data. The waveform should be displayed in real time. Output and printing.

7.3 Positioning Synchronization

7.3.1 Technical Specifications The positioning and synchronization technical specifications should meet the requirements of Table 2.

7.3.2 Functional Requirements

7.3.2.1 A satellite positioning system should be used for time synchronization and setting calibration points.

7.3.2.2 Electronic tag calibration points can be set according to actual needs.

7.3.2.3 The distance pulse signal from the speed sensor should be used as the reference for distance calculation.

7.3.2.4 The location synchronization information should include real-time mileage, speed, time, forward and reverse driving, and mileage increase or decrease.

7.4 Rail Profile

7.4.1 Technical Specifications The technical specifications for rail profile inspection should conform to the provisions of Table 3.

7.4.2 Functional Requirements

7.4.2.1 The rail inspection vehicle shall use non-contact measurement methods to detect the rail profile in real time.

7.4.2.2 The system output should include the left rail profile, right rail profile, rail side wear, vertical wear, and total wear.

7.5 Environmental Monitoring

7.5.1 Technical Specifications The technical specifications for environmental monitoring should comply with the provisions of Table 4.

7.5.2 Functional Requirements

7.5.2.1 It should have the function of acquiring no less than 4 video signals.

7.5.2.2 It should have the function of overlaying information such as line name, speed and mileage.

7.5.2.3 It should be able to retrieve video images by mileage.

8.1 Vehicle Inspection

8.1.1 The vehicle shall be inspected and tested in accordance with the methods specified in GB/T 12818.

8.1.2 After installing the interface device and detection system equipment, the vehicle clearance shall be inspected in accordance with the method specified in GB/T 16904.1.

8.1.3 After installing the interface device and testing system equipment, the vehicle's electromagnetic compatibility shall be tested in accordance with the method specified in GB/T 24338.3.

8.1.4 The flame retardant properties of non-metallic interior materials used in work and living areas shall be tested according to the method specified in TB/T 3138.

8.1.5 The limits for indoor volatile organic compounds shall be tested in accordance with the method of TB/T 3139.

8.2.1 Inspection of mechanical interface devices

8.2.1.1 Strength shall be tested in accordance with the method specified in TB/T 3548.

8.2.1.2 Visually inspect the vibration reduction and height adjustment functions of the beam.

8.2.1.3 Visually inspect the anti-loosening function of the external mechanical interface device.

8.2.2 Inspection of electrical interface devices

8.2.2.1 Use specialized instruments to measure the power supply voltage and frequency.

8.2.2.2 Use a power meter to check the nominal power of the power supply.

8.2.2.3 Visually inspect electrical measures such as isolation and voltage stabilization, and use specialized instruments to test power supply harmonics.

8.3.1 Basic Requirements Compliance Inspection

8.3.1.1 Shock and vibration tests shall be conducted in accordance with the methods specified in GB/T 21563.

8.3.1.2 Electromagnetic compatibility shall be tested in accordance with the method specified in GB/T 24338.4.

8.3.1.3 The protection of external equipment shall be tested in accordance with the methods specified in GB/T 4208.

8.3.1.4 The cabling design shall be inspected in accordance with the method specified in GB/T 34571.

8.3.1.5 Select an actual line for testing to check whether the continuous normal working capability of the testing system meets the requirements of 4000km or 48h. Requirements for routine testing.

8.3.1.6 Check whether a UPS is installed and its capacity.

8.3.1.7 Simulate operating conditions or select an actual line for testing to check whether the testing system meets the requirements specified in

7.1.7 to 7.1.10. Function.

8.3.2 Track geometry inspection

8.3.2.1 Technical Specifications 8.3.2.1.1 Maximum Permissible Error The test was conducted on a dedicated test track with pre-defined track geometry irregularities and track displacement measurement capabilities. Track displacement measurement was used for... Provide correction values for the lateral and vertical load displacement of the rails when vehicles pass. The technical specifications of the rail displacement measuring device should meet the requirements of Table 5. 8.3.2.1.2 Repeatability Tests should be conducted on dedicated test tracks or operational tracks with stable track conditions. For operational tracks, the TQI should be no greater than [value missing]. High-speed railways with a track gauge of

5.0 mm or passenger/freight mixed lines with a TQI (Traffic Quality Index) not exceeding

8.0 mm. Track geometry inspection systems can be used to inspect the same line within a short period. Two tests were conducted under the same conditions, and the results of the two tests for each test item were calculated for a section of no less than 5 km (including straight and curved sections). The 95th percentile of the absolute value of the difference is used to check whether it conforms to the requirements of Table 1. 8.3.2.1.3 Reproducibility The test should be conducted on a dedicated test track or an operating line with stable track conditions. A high-speed railway with a TQI (Trajectory Quality Indicator) of no more than

5.0 mm should be selected. For passenger and freight railways with a TQI (Trajectory Quality Indicator) not exceeding

8.0 mm. Track geometry detection systems can perform short-term testing on the same line under different vehicle operating directions. Multiple tests were conducted at the same testing speed, with a section of no less than 5km (including straight and curved sections) selected for each test item to be tested twice. The 95th percentile of the absolute value of the result difference is checked to see if it conforms to the requirements of Table

1.Based on the performance of the detection system, the speed level should be selected to include at least Including 25km/h, 80km/h, and 160km/h.

8.3.2.2 Functional Check Check each function specified in 7.2.2.

8.3.3 Positioning Synchronization Verification

8.3.3.1 Technical Specifications The test was conducted on a dedicated test line with precise measurement and calibration point distances, where track geometry characteristics were pre-set at the calibration points.

a) Calibration point mileage. The calibration point mileage is used as the standard value. The mileage value of the track's geometric characteristics under operating conditions passing through the calibration point is calculated and compared with the standard. The difference in values is checked to see if it meets the requirements of the maximum permissible error index in Table 2.

b) Mileage. The distance between two calibration points is used as the standard value. Calculate the difference between the measured mileage and the standard value, and check whether it conforms to the maximum value in Table 2. The regulations on permissible error indicators.

8.3.3.2 Functional Check Check each function specified in 7.3.2.

8.3.4 Rail profile inspection

8.3.4.1 Technical Specifications The static measurement value of the rail's full cross-sectional profile is used as the standard value. The difference between the rail profile measurement value of the on-board detection system and the standard value is calculated, and then... Verify whether it conforms to the maximum permissible error index specified in Table 3.

8.3.4.2 Functional Check Check each function specified in 7.4.2.

8.3.5 Environmental monitoring and inspection

8.3.5.1 Technical Specifications Check whether the video resolution, frame rate, and continuous storage capacity meet the requirements of Table 4.

8.3.5.2 Functional Check Check each function specified in 7.5.2.

9.1 Routine Inspection

5.1 Routine inspections of the specified contents shall be carried out in accordance with the provisions of GB/T 12818.

9.2 Factory Inspection The factory inspection shall comply with the provisions of Table 6.

9.3.1 Type testing of the contents specified in

5.1 shall be conducted in accordance with GB/T 12818.For the contents specified in

5.2 to 5.5, type testing shall be conducted under any of the following circumstances. For formulaic testing, the test items shall conform to the provisions of Table 6.

a) During initial manufacturing;

b) When significant improvements in structure, process, or function affect performance.

9.3.2 If any of the following conditions specified in Chapter 6 apply, type testing shall be conducted, and the testing items shall conform to the provisions of Table 6.

a) During initial manufacturing;

b) When significant improvements in structure, manufacturing process, or function affect driving safety;

c) When there is a significant difference between the factory inspection and the previous type inspection.

9.3.3 If any of the following conditions specified in Chapter 7 apply, type testing shall be conducted, and the testing items shall conform to the provisions of Table 6.

a) During initial manufacturing;

b) When significant improvements in structure, manufacturing process, or function affect performance;

c) When there is a significant difference between the factory inspection and the previous type inspection. GB/T 25021-2026. Railway Large-scale Track Maintenance Machinery - Track Inspection Vehicle ICS

22 National Standards of the People's Republic of China Replaces GB/T 25021-2010 Railway large track maintenance machinery track inspection vehicle Published on 2026-03-

31 Implemented on October 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.