@Windy City posted:What about upgrading the horizontal motors in the MPC era GP-7 8375 or GP-20 8776? Wouldn't pullmor motors with diecast trucks and magnatraction be a significant improvement?
No. As John said, the GPs just don't weigh enough. Magnetraction helps a little, but having all axles powered is a huge advantage, which you can only get with can motors, whether of the horizontal or vertical variety. And then you add traction tires. (I say this as a Pullmor-lover.)