I'm looking to purchase a switcher and came across an Athearn SW 1500 BNSF at my LHS. There are two models on the shelf... One looks like a plain SW 1500 while the other has the words "Radio Controled do not remove cab" under the engineer's window and there is an orange LED light on the roof of the cab! Is this an operating light? The loco box is marked DCC Ready. Both locos are priced the same.