Yep, Matter of the fact I has 2 of them, a GP-9 in NP, and a GP-7 T.T. In MILW they all have the same mechnisim, and I love them, smooth and strong, Matter of the fact, they will pull 5 cars up my unrealistic grade accrost the center of my layout with no problems (close to 9%!!!). they take a little break in time, I ran mine about a hour each with no cars at about 55% throttle, the loosened up and have been awesome. Compaitable to any of the high end locos I have. Just make sure you get a current run. a good give away is if they have body mounted couplers, those are the ones you want, stay away from the older ones with the truck mounted couplers, they don't run as well and have a tendosy to loose the motors at inoppertune times!:curse:
so my advice, get a pic of the loco you are looking at, post'em here and we'll tell ya what need to hear!
as a refrence, 99% of the Newest atlas stuff is really good, pretty much anything built after 1998. they have some things that they contracted with KATO (Like the GP-38) on that are really good from earlyer dates too but recently they have been putting out some really impressive stuff.