Funny you mention trains... the Austrian Federal Railways still have several hundred cars without automatic doors in service and don't seem to want to get rid of them in near future. Usually the conductor patrols the train after every stop and checks the doors, but they're never locked, only closed. Those cars are great anyway... the windows slide almost all the way down, letting in cool air, the seats are thick dark red plush... pure 1950ies! And lovely to ride too, most modern railway cars are uncomfortable comparedd to those old cars.
