The maintenance workers of the subway sorting system are tired, and the subway runs for a long time, and all of them run during the day, and they d
The maintenance workers of the subway sorting system are tired, and the subway runs for a long time, and all of them run during the day, and they don't stop until after eleven o'clock in the evening, and they can only be repaired after stopping. Subway maintenance personnel work hard, often late at night, but they have great responsibilities. Subway is a kind of fast, large-capacity and electric traction rail transit built in cities.
Trains run on fully enclosed lines, the lines located in the central city are basically located in underground tunnels, and the lines outside the central city are generally located on viaducts or on the ground. In addition to the subway, it also includes elevated railways or railways laid on roads. Therefore, the subway is the exclusive right of way, and there is no grade crossing, which is also the fundamental sign that the subway is different from the light rail transit system. The earliest (and first) subway in the world is the Metropolitan Subway in London, England, which was built at 1863.