There is a space 1.74" x 3.48" clear under the tram body to permit the installation of a powered chassis. The only item that can stick up into the "control cabin" on the loco is the electric motor itself. None of the wheels, gears, or sprockets can protude above the floorplate.
The plan is to drive a single rigid axle using a 59:1 Falhauber gearhead motor through a set of 90ยบ helical gears. Ideally, the second tilting axle will be connected to the first using Serv-o-link Delrin sprockets and chain. The helical gears will need to be enclosed in a small gearbox to keep them in proper mesh and reduce any strain on the motor shaft and/or bearings.
Drive wheels should be slightly larger than 14" diameter, but that will depend on the minimum size of sprockets that can be used. Bearing boxes will be hung on the ends of the axles. One set will be fixed, the other will be free to move in their vertical axis.
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