I think we'll need a better definition of subway. I believe in England that's a below-highway pedestrian tunnel.
More seriously, in Boston we sometimes use the word "subway" to refer to several MBTA lines, and non-train-nerds don't really distinguish between the Green Line (which is probably "light rail") and the others. Of course, real trains sometimes run underground (e.g. near New York Penn Station). I'm not sure if the distinction you're after is urban rapid transit with a "every N minutes" notion, tending to have fare gates vs longer-distance "real trains" running on traditional railroad tracks, with a timetable (including commuter rail), tending to have tickets and conductors or if it's about whether the subway/rapid-transit system is connected to the national rail system or if it's about being in tunnels (which seems not the right issue to me).
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