Found this helpful for me as a Yank trying to understand what y'all are gabbin' about from the UK. https://train.spottingworld.com/List_of_UK_railfan_jargon Feel free to add anything else you've come across. I tried to post the whole list here without the link, but it's too long for the Forum to accept.
Bunking is known as traveling on a train without a ticket. Or fare evasion I've never heard it used as a term for entering a depot without permission before. Might be some truth to it though.
Rancid overnight! Did a few of those in my time, even worse when the Mark 2’s started appearing as the seated stock on overnight trains as any form of Kip under those unrelenting fluorescent lights was nigh on impossible. Which, when the point of the trip was to cover a scenic route with rateable traction such as the West Highland or Far North, meant you missed a large chunk of it when involuntary torpor kicked in and you kept nodding off.
If you wanted a properly rancid overnight look no further than the Kent overnights. Often there would be a steam heat only GUV behind the crompton which is a problem when it’s minus five outside and all cromptons were ETH only. There were iceicles forming in the windows.
