In the world of industrial motors, there is a somewhat common slang term for the junction box that is “pecker head.”
I decided to see if I could find an etymology for this term and I stumbled across this site that I found very entertaining and thought there might be others here that would also enjoy it. It’s not meant to be anything other than fun, and I think they’ve achieved that splendidly.
I think the railroad connection to the junction box term is plausible, but it’s not the sort of thing one would expect to show up in print very often so I doubt that we’ll ever know for sure.
Anyway, if you want to know what a “Tommy Dodd” is, or “smooth” this is your place.
From Mr. Glenn Holmes Sr., Brotherhood of Railroad Switchmen (Local #72): Railroad Talk.