I've had one of these apart. There is a 9434 Pittman mounted in the firebox. The rear set of drivers has a worm shaft with cups for a driveshaft at either end. The front worm shaft just has a cup for a driveshaft at the rear. The setup is motor/flywheel/drive shaft/worm shaft/driveshaft/worm shaft. There are no u-joints as the drivers are not articulated (and need every bit of 072). Parts are hard to find. I'd try contacting midge and MTH to at least obtain the worm shafts and motor mount if you want it to run. The motor, flywheel, and drive shafts can be sourced from other sources (Lionel, etc.).
I used one of these engineering samples/catalog artwork samples as a project base over the summer: https://ogrforum.ogaugerr.com/...locomotive-from-junk
