Full size trains have been operated many years by radio control at Granite City Steel, now US Steel. The guys are much of the time very far away from the locomotive when they are operating them. They are out in the yard switching various cars on to different spurs.
Not just spurs either. There are several railroads operating radio controlled trains in and around Chicago, on mainlines, and over public crossings. Kinda gives you that nice warm fuzzy feeling, don't it? remove my-wife to reply :-)
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