When we take ordinary trains, we often hear the sound of “clang~clang~”.
That is because the train has not been processed after the track is laid, so there are gaps between the tracks.
When the train reaches the track joint, it will make a “clang~clang~” sound.
In order to further improve the riding comfort of passengers, and at the same time to reduce noise and damage to the train, after completing the basic laying procedure of the track, the subway will also weld the heads and tails of each track together to form a long and smooth whole track~
In this way, after laying, adjusting, and welding one section at a time, the short track becomes a long track, and then the long track becomes a complete subway line, extending from under our feet and finally leading to our way home.
