UNDERGROUND - SUBWAY - METRO

The underground, subway, or metro, whatever you call it, are all the same type of mass transit vehicle that goes under the ground. From London to New York, from Hong Kong to Moscow, subways are an important form of transportation. Traffic in modern cities is often quite terrible, and it can sometimes take hours to cross a crowded city in a car or bus. Subways help to solve that problem, since they don’t have to stop at the traffic lights, and hundreds of people can take a subway train together. In larger subway systems, such as Mexico City’s, there are lines that go far beyond the city centre. In this way, people who live in the suburbs can take a train to work. This reduces the amount of traffic entering and leaving a city. It also helps reduce air pollution, a serious problem in many cities. Finally, subways are usually cheap. Basically, in a city with a subway, everybody wins!