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This has probably been asked before, so please pardon my ignorance, but I was watching 'Trains and Locomotives' today on RFD and they were showing Norfolk Southern at Horseshoe Curve, and I got to wondering.... How come helper units (pushers) are always hooked on the back of the train, instead of MU'd with the lead units? Only thing I can come up with, is that it's easier to just uncouple them from the rear of the train and be ready for the return trip, instead of having to unhook the air lines and electrical connections to the lead engines. I guess another reason is that they can switch onto another track (out of the way of other traffic) after they've uncoupled from the rear of the train, thus letting the train continue on it's way, rather than having to stop the train and wait while the helper locos switch tracks to get out of the way if they were coupled in front of the lead units. I may have just answered my own question there with common sense, but I'd like someone who knows to affirm or correct me. :-) Thanks! Jeremy
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