In order to ensure the smooth operation of the train and the good riding experience of passengers, finding out the line defects is the first step.
Railway line workers need to lie on the rails, use the horizontal surface of the rails as a reference, and observe the ups and downs along the rail surface to determine whether the line is smooth.
The better the smoothness of the railway line, the farther you can see. When there is a problem with the railway line, the line workers will deal with it in time to ensure that the line equipment is in good condition.
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