Proto 2000 Series HO Scale Item 30857 D&RGW Denver and Rio Grande Western SD50 diesel locomotive #5512. Limited Edition, features Proto 2000 Magnetic Knuckle Couplers. See-through fans on long hood.  Loco has never been removed from styrofoam, factory sealed C10.  Box has minor ding to the top of an end panel, bright, clean, square and solid.