The Monkey and the Engineer

More a railroad song than a train song, but Sam Amidon - Walking Boss

Lemon Demon-My Trains

There’s entire Johnny Cash boxed set of nothing but train songs

Also: The Midnight Special (CCR or Willie Watson) Wabash Cannonball (Jerry Reed) Boxcar Walls - Townes Van Zandt Waiting for a Train - Jimmie Rodgers Ben Dewberry’s Final Run - Jimmie Rodgers

Quad City DJ’s – C’mon N’ Ride It (The Train)
https://www.youtube.com/watch?v=cPz16LHTtpo