Every morning and every evening of my commute I board a train like this. It is labeled right there on the side: “Do Not Ride”
I really hope nothing inconvenient or bad happens on the train ever, because I can already hear them saying, “we told you so!”
Imagine being the proud designer about to launch your swanky new train car and then being told by your Risk Management team that you need to put labels all over it to warn people not to ride it.