A someone working with MBTA data I can chime in. The story is rather complicated. Boston's subway system serves a population of around 2 million, including adm

A someone working with MBTA data I can chime in. The story is rather complicated. Boston's subway system serves a population of around 2 million, including administratively separate cities like Somerville, Cambridge, Brookline and Newton that are more like boroughs than separate cities. The rest is served by the commuter rail system and bus system, which do a good job of covering most people (probably about 4 million of 5 million). There's actually 145 subway stations (though that includes a few underground stations on the silver line, technically BRT for now), but the article didn't the green line (America's first subway, 1898), because it's a "light rail" subway, not a "heavy rail" subway. Those stations all got retrofitted with wheelchair access or else were already above ground stations with access. It's fair to say that those 145 stations serve about 1/4 the population of the MTA in New York.