How to wire a modified series wound motor

Hello All, old guy here, but new to the forum. Recently I sourced a couple of freebie 7” forklift traction motors to convert an old 1/4 scale ICE miniature locomotive to electric drive. I got one motor running on the bench, but the second just buzzes a bit and let’s out the blue smoke. This one has some odd modifications, so I can’t figure out if it’s a lost cause or can be wired to run.

Thought I would ask here for some suggestions on how to make this functional. The brass straps apparently were added as a mod, to connect the brushes.

Any suggestions how to wire this up? I plan on running it with 48 volts...

Thanks much,
Glenn