Digital Command System
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Digital Command System (DCS) is an electronic control system for O scale 3-rail model trains and toy trains, developed by MTH Electric Trains as a rival to Lionel's Trainmaster Command Control. It is similar in concept to DCC, the open industry standard used by HO scale and other 2-rail direct current trains.
It permits operation of multiple trains on the same track without complex wiring, and also gives locomotives realistic digitized sounds.
Unlike Lionel, MTH has not licensed its standard to any other company. Hobbyists often have difficulty getting DCS-equipped locomotives to operate in conjunction with TMCC-equipped locomotives.