OK. FYI, I thought you were a troll. When I googled J-girls all I got was freakin' porn and "Suzie is lonely do you want to talk" sites. Now I see you meant The Johnson Girls. I will go look further.

"Mike - Deirdre

(tune and additional lyrics, Dan Milner, © 2000)

Railroads captured the imagination of American songwriters for more than a century.
Passengers and hobos wrote most of the songs but "Mike" comes from the
section gangs who, including women, maintained an assigned length of track, replacing
rotten cross-ties, aligning rails and performing other tasks amidst such dangers
as the one encountered here. Probably originating in Missouri, it was published
without a melody in John and Alan Lomax's American Ballads & Folk Songs."

That's a start. Sorry about the 'shithead' remark.