Question

where
do the trains carry​

Answer 1

Answer:

Usually they run in tunnels in the city center and sometimes on elevated structures in the outer parts of the city. They can accelerate and decelerate faster than heavier, long-distance trains. The general term "rapid transit" is used for public transport such as commuter trains, metro and light rail.

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Answer 2

The trains carry people or things from one place to another it could be incide city like metro or outside city