Some things in life are unavoidable. Sometimes we see things we don't necessarily need to. Train crew's see interesting characters on a daily basis - why shouldn't your model railroad?
The exposing of ones rear end, also known as 'Mooning', has long been associated with the passing by of complete strangers, friends, etc.
DISCLAIMER: These are intended for nothing more than a good laugh. BLMA Models & Atlas Model Railroad do not endorse public nudity, flashing, or any other act of exposing ones private parts.