Yesterday I saw 2 pumpkin H2 B40-8Ws hauling a consist of - one tank car and a covered hopper. I think the road number of the lead unit was BNSF #526 This was on the Beardstown sub south of Jacksonville, IL where trains can be easily seen from the highway. Don’t have a photo of it since I didn’t have a camera on me, but I’d say that even really short consists of only 2 cars have a prototype:)
Could have a been a local job, here in So Cal, BNSF will use sets of road power on short locals, kinda cool to watch them venture onto light rail to pick up and retreive a few cars.
Dave