They run great... and, lash-up fine for MU ...and, sound like crap.
K-LINE K2780-4935 Black Jack GG1 (shown). There probably isn't a lot that can be done... but, here are the guts...
This is the same era as Lionel's Celebration Series (Open Frame motors) GG1s... except with Can Motors ...and except for the trucks, a whole lot more body detail.
Those are RS 385 PH's
Lionel Board...