Two bullet train mechanics are measuring the height and thickness of the wheel rim with the “four inspectors” that can be accurate to 0.1 mm. High-speed train running, safety is crucial, maintenance work must be improved.

In order to ensure the safety of every trip, “doctors” need to walk more than ten kilometers on the roof, under the chassis and in the gutter all night, overhaul dozens of bogies, and confirm whether tens of thousands of parts were in good condition.

During the day, you sit on the comfortable seat of the motor train and look out the window. At night, the staff laid on the ground and carefully checked each screw on the seat to make sure it was not loose.

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