Erotic Express (1983)

Hop on the "Erotic Express" with the horniest group of commuters you'll ever see. They want nothing more than constant, hard and steamy sex. Take your seats; it's time to leave the station! It's non-stop seat swapping with this group! Getting off on this train takes on a whole new meaning. They're looking for this choo-choo to find a tunnel that goes real long, and real, real, deep!