Yes. I see what you are saying — that ‘sub’ implies below, but in New York City many subway trains run above ground in uptown Manhattan and the other boroughs and are still referred to under the same name. This may not be semantically accurate, but it is a de facto name for the public transportation system.
If the trains are primarily (yet not exclusively) below ground, they are called subways. If it’s entirely above ground, however, they’re generally known as light rail, trolleys, or sometimes by other terms. One, near San Francisco, is even affectionately termed “BART” (Bay Area Rapid Transit).
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