Quistion for the guys who model Norfork Southern and Union Pacific, What is considered mainline and road switcher loco's now. I model 50's to 60's mostly NKP but now I thought I would go present day. Is there such a thing as a road switcher now. Right now I have a NS sd-70, sd-45-2 sd-60m,dash 8-40c. In Union Pacific a sd-70ace. I also have 2 mp-15ac's in SOO markings, one all red and one in white and red. Plus a GE-ac 6000 demo. The last three were deals at a local train show and I thought why not. Any advice. As always many thanks for help. CF.