by Stmtrolleyguy
I was reading the "interesting South Side consists" thread, and I saw the video of the two trainsets coupled together running as one train, and I was wondering if both locomotives are providing power, or if only one is used to push the entire set? I know that on multiple unit lashups you can bring units on or offline, and sometimes you have one locomotive providing traction and another providing HEP, but what happens when two commuter rail trains are coupled up, putting one of the locomotives in the middle? Can both provide tractive power for the train at the same time?