EMD traction motors

Trains Magazine General Discussion
1

Anyone know where I can find the specifications for the various EMD traction motors.

Specifcally I’m wondering what the max voltage, max current, max peak HP, max continuous HP are.

Specifically the models I’m wondering about are D37,D77,D78,D87,D90.

Also are they interchangable/upgradable on a given size truck. I know that many older GP-7/9 that originally have D37 now have D77 motors. Other than that I really don’t know anything other than model numbers about traction motors.

Thanks in advance.

Ungern

2

You just might try writing EMD!!!

3

It’s just I’m wondering if my letter would end up in their circular file cabinet next to the desk since I am only a lowly railfan with interests in the tech side of things. (I do have the engineering drawings for several older models of triple valves and model C and D Janney couplers in case I want to machine any from scratch.[%-)]

Ungern