I got a great deal from Mr Muffin's Trains...you may have seen his name here...on a couple of MTH GP9s in the Seaboard livery...20-20550-1 and 20-20551-1. I put them on the track this evening and they are really nice engines. They look good. They smoke good (if you like all that smoke from a diesel). And, best of all...they run very, very well...smooth, slow...just everything I would expect from a PS3 model from MTH. I was particularly amazed...yes...truly amazed...that these navigated my Atlas O 7.5 switches with no problems whatsoever. I don't know if I got lucky...or what happened...but, if all engines crossed those switches so effortlessly...without hesitation...pause...or even a blinking light...my train world would be so much more fun. I have SD70ACe and other engines that are not so lucky...interesting that some of these longer engines...greater distance between pickup rollers and trucks...seem to have some difficulty with these same switches. Not all of them do...but, sometimes I cannot even predict which ones will make it through. Yes, the switches to which I am referring even have the closure rails wired for power.
Just my observations...no feedback required...but, your comments are welcomed.