That would be a ‘not to be moved’ flag irl. If that’s what this means, don’t really understand the question.
Normally such flags are put on units or locos where there is a reason not to use the unit, either due to fault, failure or some other reason the unit is out of service. In other words don't move the train until you've been absolutely told to do so by your manager or controller.
Not OP but in the list of trains when you select Train Depot, instead of the header saying Class 158, it is titled DONT USE ME (or something very similar). My guess is that it is a bug that the next update to the route should (might?) fix
It's an old version of the Class 158 that is not functioning (well at least). I guess it was included by mistake.
Hey all, I just logged in to check and the listing looks fine to me, no mention of "Don't Use Me". Can others report if this is happening on the stable version of the game? Are you using any mods per chance or older versions of the game? Cheers, Jan