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Well, there are different situations with different answers. 1) I've seen pictures of a UP yard using remote controlled switchers. The only difference in those engines are some decals warning that the engine may move without anyone in it. It is controlled by an operator with a remote control, who walks around the trains themselves, somewhat like a model railroader with a walkaround unit does. As I understand it, they are limited to yard service, but someone else might have more info on that. 2) There are in train remote controlled units on mainline service. Engines like the SD-40-2 and SD40T-2 "snoot" engines have remote control electronics in those longer noses. At least one such engine is in the front of the train with other normally outfitted engines, and at least one is in the middle of the train (some 2/3rds down the train) with other normally outfitted engines. The engineer in the front of the train controls these midtrain engines, and these trains grow to more than a mile. Newer engines that have these kinds of controls are operated in the same manner, but do not have any external differences (as far as I know). 3) The Haysi RR in Virginia initially had an old B unit EMD F engine as it's lone engine for shuffling cars around a mine (the Clinchfield RR had trackage rights, and performed all other operations on that shortline). It had some controls and a small window retrofitted in the B unit, but was mainly controlled remotely by radio control. I don't know if any of that is what you were looking for, and I'm sure that other members might know of different situations, and more details. ---jps
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