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Tyson (and others, but you address ths issue in your post)-- In the US the commuter equipment uses head-end power (HEP), so running around is a costly and time-consuming problem, even if we had double ended locos. To do it, you need a crew of carmen/electricians on the ground, who have to (1) shut down the power to the train--no lights or A/C, (2) unplug the HEP cables, (3) uncouple and run around while the crew walks to the other end, (4) couple up to the other end, (5) re-plug the HEP cables and test, (6) power back up. I've seen the process take as long as 30 minutes or more on splitting of ATK trains. Aside from being prohibitively costly, generally you cannot afford the extra turnaround time necesary to do it. And with some run-throughs, like ATK's Surfliners that go through LAUPT (a stub-end terminal--so they head in and "back" out if set up for push-pull) you would leave the pax hot and in the dark during the whole process. Push-pull circumvents all that. Your EMUs and DMUs basically accompli***he same thing, except that all the axles are powered. Cheers, Mate!
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