DCC ON BOARD locomotives feature dual-mode digital command control decoders enabling operation with a standard DC analog power pack or any NMRA-compliant Digital Command Control system. Speed, direction, and lighting control. Operating Smoke Unit Operating Headlight Performs Best on 18" Radius Curves or Greater HO Scale: 1:87 With smoke and operating headlight. DCC ON BOARD locomotives feature dual-mode digital command control decoders enabling operation with a standard DC analog power pack or any NMRA-compliant Digital Command Control system. Speed, direction, and lighting control. Performs best on 18" radius curves or greater.