I can't remember if this was said to me or if I overheard it. Maybe I'm fabricating the memory entirely, but in any case, I recall a conversation where someone said almost exactly what you did in that last sentence. The reply was of course
"Well someone always gets hurt."
"What do you mean?"
"It costs someone money to put those bathrooms in."
Cue the "what the fuck did I just hear" alarms
Right? It would be so much cheaper if we just used to the reinforcing steel to create thin tracks which we could put much more thermally efficient and eco-friendly wheels onto. In turn, we could carry exceptionally large loads of cargo or people over vast distances for a mere fraction of the cost (monetary) and a fraction of the cost (to the world) by creating long, highly aerodynamic vehicles capable of moving at ridiculously high speeds that would be uncontrollable for the average joe on the road.
Wait, haven't I heard of something like this before?