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There's usually someone who attempts to get on the trains if they stop in a platform. They get flummoxed when the find the doors locked, or no door buttons on the 950. Woe betide any crew leaving doors unlocked, an elderly couple has been found sitting in one of the Mk2 barriers in darkness and cold doing a run on the GE. It was pure chance someone spotted them, normally no-one has cause to go into the make up vehicles. I think stickers plainly saying NOT FOR PUBLIC USE on the doors maybe isn't enough for the terminally thick. It's bad enough people peering through the windows, complete goldfish bowl effect.
I can second that - 6 people got on the TnT 31s and RIV consist at Kettering just before Christmas. It left with them onboard, and I have no idea what happened to them.