MBTA regularly and then some
MBTA commuter rail rarely, been years
LIRR when I would visit my grandmother with my father and we'd go into the city
I think I've taken the NYC subway a couple times, but strangely don't remember much if anything. I remember my dad and I, as well as two guys we weren't with, were practically at the end of a train when it stopped at a station. Not sure which one. But the train was longer than the platform and we were rushing up the cars and passing through. Didn't make it and missed the stop. I'm not even sure if it was the subway or LIRR or what it was...
And a wine train/dinner train out in Nappa Valley, California once
That's all I can think of. Would love to one day take an Acela for my trips to NY.