In addition to the doors, which just seem dumb after 40 years, they have to play the safety spiel--in English and Spanish--every time someone gets on before the tram can move. If, in the middle of the spiel, someone ignores the guy on back and boards anyway ... they have to play the same spiel again. I've noticed it seems to exasperate the tram announcers, who literally end up yelling at people not to get on, even tho the tram isn't moving.