Hi Montanan, That's an interesting shot, at first I thought the earlier Loco was a Calf when it's a full sized F Unit being used as a Calf I assume? It's also interesting to see the overhead Catenary Electrical contact lines for the Pantagraphs on the Loco's.
I had an older MRR friend that used this system along with regular DC to control two seperate Loco's on the same rail line. That was Riff Riffel, God rest his soul.