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. The English name is metro (Underground Railway). ?
The development of history
1860, the first 6-kilometer subway between Farrington Street and Bishop Road in Paddington, London was started, and it was built by excavation and backfilling.
1863 65438+1October 10, the whole line is open to traffic. This is the world's first underground railway system, Metropolitan Railway, which transported 9.5 million passengers in its first year of operation. At that time, the underground railway had to be pulled by steam locomotives because the electricity had not been popularized, and because the exhaust gas released by locomotives was harmful to human health, the designers at that time had their brains wide open, and the tunnels had ventilation slots connected with the ground at regular intervals.