Underground, subway and metro are common names for a form of mass transit public transport system employing trains. In many cases, at least a portion of the rails are placed in tunnels dug beneath the surface of a city. Many systems combine Metro with other types of transit. See also the category:Bus rapid transit, and Wikipedia:WikiProject Rapid transit for coordination.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).