Is this a term used only by a specific railway company or a generic term used by all?
Jarrell
It’s a generic term for yard locomotives, used by crews at least.
Woot, 900th post! On my way to 
!!
Matthew
I’ve also heard it refered to Model RR Operators that like to work the yards.
Indeed, it is one of many slang terms for a yard switcher, not all of which are printable in a public forum.
We use the term puddle jumper. Or just call it that piece of @#$&! in front of the tower.
Nick
You guys crack me up…I can always get cheered up by reading posts on this forum!!