Translate the following passage into English
High-speed train underground subway system, mainly in such as New York, London, Paris, Beijing, Sydney and Tokyo city. Subway faster than the bus, high efficiency, they can take you to the city of almost any location, and then you only need to walk some distance to get to where you want. They are inexpensive and help solve the city's traffic problems. The only drawback is that it metro are often crowded and noisy.