Subway wind, water and electricity all need to work at night, because sports cars are needed during the day, and power supply to locomotives must be guaranteed. Only at night can the power be cut off to repair the equipment.
Subway is a form of railway traffic, which refers to the urban rail transit system that mainly runs underground, that is, the abbreviation of subway or subway. In order to match the built environment and consider the construction and operation costs, many of these systems may be transformed into ground or elevated parts outside the city center.