Paul,
I did not contact Atlas but I did some cross checking with different locomotives and the saddle was the same so I bought one of the newer motors. It fit just like the old one but I did have to change out the flywheels as the new ones were too small and the worm gear spline would not engage.
Paul
Have you tried contacting Atlas and asking them? They've always been very good about responding to my emails - usually within 24-48 hrs.
Tom
https://tstage9.wixsite.com/nyc-modeling
Time...It marches on...without ever turning around to see if anyone is even keeping in step.
I have Classic Atlas EMD GP-35 locomotive and need to know if the Atlas GP motor #9480100 and #480001 motor saddle will fit? The GP-35 has the same motor as the GP-30.