I've thought about this, too, but have yet to open up the loco and evaluate the practicality of installing the motor. Certainly, all electronics would need replacing - motor driver, sound, radio board. The most likely scenario for me is to leave the Pullmor motor in place and upgrade the electronics to ERR AC Commander and Railsounds. I'll probably leave the piston-operated smoke alone. With the recently Harmonized (K-Line) J-1e Hudson and a recently upgraded 3rd Rail J-1d on my roster, plus a bunch of J3s, this isn't a high priority.