How about some version of the following:
Small, modern (quiet!) can motors (3), same look - you can even use the excellent but way over-scale PW tooling
for the basic unit (lotsa room). Manual boom lift screw retained; one motor on an axle for propulsion; one motor to rotate cab;
one motor to lift/lower cable/hook. Really easier engineering than the PW "gearbox".
Command control - movement/rotation/cable; no cruise (low gearing a must - and prototypical); no sound; dummy couplers (like original); pulls 2 cars, max.
Maybe an LED light.
Price range of the command-control Trackmobile.
I'll mail you my check; just let me know.