So I have been paying attention to the prototype I am looking to model (The Berskshire Sub) of CSX line between Boston and Albany. I have noticed the Amtrak service that d=goes through. I think it is a part of the Lakeshore Limited but not certain. Anyway, I notice it often runs with three locos. Two cabs in the same direction and then another pushing in reverse. I get why they would have a cab on each end forgoing each way but why three? The train usually has maybe five cars total. Seems like overkill, or are they probably just relocating one of the locos?