地铁 Subway. 制作者：城轨 1203 班 卿甫亮. 地 铁 定 义.
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Is the world's first underground railway system in 1863, Britain opened " Metropolitan Railway ", was built in order to solve the traffic congestion in London at that time. When power has not been popular, so even the underground railroad can only use steam locomotive. Due to the locomotive releasing gas harmful to human body, so the time of the tunnel and ground every distance will get through the ventilation slots. In 1870, London opened its first passenger drill more subway, across the river Thames near London bridge tower, but is not successful, the railway was shut down after several months. The oldest drill type underground railway, opened in 1890, is located in London, connected to the central and southern regions. Railway builder initially plan to use the similar cable car driving method, but in the end with the electric locomotive, the article makes its first electric underground. The opening of the subway in London the city early in 1906 for the entire quantity of electrification.
Save the land
Because of the high general metropolitan urban land value, the railway was built in underground, can save floor space, make the ground can land for other purposes.
To reduce the noise
Chengdu metro logo
Railway built in underground, can reduce the ground noise.
Because of the subway route don't and other transport systems (such as surface roads) overlap, cross, therefore less driving traffic disturbance, can save a lot of commuting time.
To save energy
Under the global warming problem, the subway is the best public transport. Due to metro train operation speed stability, a large number of save commuting time, make people willing to take, can replace many of the energy consumed by a drive.
To reduce pollution
General motors use petrol or oil as an energy source, and the subway to use electricity, without exhaust emissions, will not pollute the environment.
One is a large capacity. 2 it is fast.
The vast majority of city rail transit system is used to carry the city commuter passengers, while in the city rail transit system on many occasions will be as the backbone of the city traffic. Usually, city rail transit system is a lot of city for a method to solve the problem of traffic jam.