From what I've been reading these past few weeks about old #19, it's apparent that the poor old beast is used up and worn out. To properly repair it, cubic dollars will be involved. The D-17000 prime mover manufactured by Caterpillar has been obsolete for about 20 years, and while parts can be had from Cat or Hatch & Kirk, such parts will be very costly as they are nearly one-offs. To seriously deal with the prime mover problem, newer engines will probably have to be acquired and fitted. Cummins, I believe, did make an engine to replace the D-17000, but I don't know its model number. It was designed to bolt up to the GE generator, but being a smaller engine than the D-17000, required various modifications to the engine mounting base plates.
I am not aware of a GE traction motor designed to replace the GE 733 motors fitted to this unit. There are quite a few of 'em still around, but they too are obsolete. Several tourist railroads have found out the hard way that the GE 733 motor is rather delicate and cannot take the kind of abuse and overloading that larger motors do on a regular basis. For example, power braking is guaranteed to fry motors pretty quickly.
In the end, locomotives such as #19 were never supposed to be "road" units as such. There are no provisions for making electrical transition to series-parallel, and the traction motors do not have blowers to cool them like road locomotives. It is geared so that probably 20 or so is balancing speed for the motors, but it was never designed to travel any great distance with much tonnage at that kind of speed.
Someone will have to decide whether it makes more sense to spend the money to keep nickel and diming #19, or bite the bullet and do a complete rebuild/overhaul -- or to locate another unit to replace it.
