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According to a fairly recent post by Atlas (either Paul or Cory), all their current motors are slow speed. But they also stopped using gray plastic, so the new slow speed motors are all black. Just to confuse us....
The place to check on Ebay for those items is http://stores.ebay.com/That-Train-Place?_trksid=p4340.l2563 If any body would have them I would guess it would be this guy.
I just took a Atlas Classic GP30/35 mech that I took the trucks out of and put the type B trucks off a Masterline B23-7 into it and it runs just fine. I have ordered trucks in the past and noticed the part numbers for the 30/35 trucks is 460300 and the GP38/38-2/40/40-2 is 480300. So since I had the trucks off the classic frame just sitting here and was working on putting a decoder into a GP38 Masterline mechanism, I tossed the 30/35 trucks and test ran it. It ran as well as before I noticed no difference. Seemed fine to me. I am guessing the differences are either in dimensions or details, if any at all. I placed them side by side and they looked the same except the 30/35 trucks were a little lighter shade in color than the 38 trucks. So if anyone knows I am now curious as to the differences. Sorry, I didn't try to swap motors those little copper tabs cause me a tad bit o'stress and had them right where I wanted them.