On Commonwealth Ave in Boston, the “T” (underground) service runs down the middle of the street! It can be quite surprising to see a train heading for you or crossing in front while you are at lights …
(I was in Boston today to meet MINI owner Susan, picking up her MINI Cooper lease from Herb Chambers MINI, recently won at MINIsOnTop! Lots more picture coverage over on GBMINI)
M&I / GBMINI 
At least the B line there has its own right of way in the center; further out on the E line it literally drives down the same lane as traffic in the street.
PS: I can’t see my name, email, etc in the fields above, the color is nearly white on a white background.
Thanks, Josh! No-one’s ever pointed that out to me before, and I don’t see it since I’m always logged in
Hey, I thought that was your security practice, DOH!!!