@Lehigh Valley Railroad posted:Never a NS with a UP? All the time...
I have seen NS with UP power on a couple of occasions here in NJ but I am not near the rails nowhere near as mush as Chris. Railroads will sometimes lease motive power to other railroads.
I once read that back in '40s and '50s the NYC only consisted locomotives from like manufacturers. All EMD or all Alco, etc. Today's railroads can consist anything to anything.