i recently bought the new MTH PS3 Maryland Midland SD45 #3449, and I've been having some trouble.
I got it today and tried running it on my layout, and it worked great on my 0-36 FasTrack curves. It's my first high-end loco and I really enjoy it - especially because the real thing runs near my house!
However, it wont go up my grade. It's 4%, which is steep, but that doesn't seem to be the problem. It just stops sometimes on it, past halfway up. The power stays on in the engine, and all the sounds stay, and I can make it go backwards, but once it stops, it wont go forward again.
My only thought is that I don't have enough power supplied to the track, so it stops because of the power required for the grade - as if it is automatically preventing a short circuit or something. The power pack I am putting into my DCS explorer is maybe 2.5 amps tops.