It might not seem like much but I'd like to read what the stickers on outside of the locomotive say. For Example GP-38 has some kind of "warning autostart equipped" sticker. It's a bit hard to read because the writting isn't very clear. I got into reading some of the stuff on the locomotive and it's probably worth it for general info.
I agree, even if the stickers themselves would be too difficult to clear up, make them a clickable object that would open a text box with the contents of the sticker. would be nice for the fine print inside of the locomotives as well.