Two historic films from BART. In particular, I recommend Along The Way, from 1968. Notable for the folky music, various shots of San Francisco with an intact Embarcadero freeway, and the introduction to the trains, at about 5’30:
And then you’ll board a train. Carpeted, air conditioned, settle in to an extra-wide, foam-rubber seat. And when you’re travelling on the surface or the aerial structures, you’ll enjoy the scenery from a full vista window.