I just finished browsing 4nscale.com and the Atlas diesels seem to be right around $69.95 for non decoder locomotives. They just received a shipment of GP40/GP40-2's recently. I have a few of those from last years release. I have a small layout (The Terrain For Trains "High Sierra") and while I am not sure of the actual grades involved, I usually opt for two DRGW Geeps to pull the train. I do have six axle Atlas and Kato engines but the struggle on the tighter curves that the track plan called for so those are packed away for a layout on another day I am not sure what railroad you wish to model, but I am sure between E-Bay, 4nscale.com and Nscalesupply.com and others mentioned here before you can probably find a decent locomotive or two and some quality rolling stock. (at risk of starting another debate here I go with Micro-Trains freight cars and the Atlas Extended Vision Caboose provide enough weight per car for optimal operation.) Good Luck and you found a great forum to seek advice, I mostly lurk here and take in all of the good info at hand!