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Users utilize their own smart device — iOS or Android — and an  intutive app to run multiple tracks, hundreds of trains and control  switches and accessories using the separately sold AIU Accessory  Interface Unit. Bi-directional communication between locomotives and the  system’s WTIU makes adding and programming locomotives simple and easy.  No more ID numbers to remember and no complex icons to decipher. It’s  fast, it’s easy and it’s fun! DCS can also be controlled with a separately sold DCS Handheld  Controller. Regardless of how you control it, DCS is compatible with all  Proto-Sound 2.0 or 3.0 equipped locomotives as well as S Gauge and O  Gauge locomotives equipped with Lionel® TMCC® and Legacy™ onboard  systems; any conventional AC-powered locomotives; or conventional analog  DC-powered locomotives in other scales, including N, HO, and G Gauge. Featuring four channels, the new WTIU can now control conventional AC  or DC locomotives allowing the user to control command and non-command  equipped locomotives on the same track at the same time. The WTIU sets  up in seconds and doesn’t require a home WiFi system to operate and can  receive commands from an unlimited number of smart devices. WHAT IS COMMAND CONTROL? In conventional model train operation, an AC or DC transformer varies  track voltage to adjust engine speed and direction. Command systems  such as DCS, however, put a constant voltage on the track (around 18  volts for DCS) and vary speed by telling each engine how much of that  voltage to use. Unlike conventional control, command control allows different  engines to do different things, even when they are on the same track — like run at different speeds, go in different directions, or make  different sounds. You can even combine several engines into a “lashup,”  working together under a single throttle. How it works: In the DCS system, commands such as speed,  direction, and sound control are sent as radio signals from a smart  device to a receiver, which translates those signals into digital  information. That digital signal is sent through the rails and picked up  only by the appropriate engine — telling it to go, for example, 37  miles per hour, blow the whistle, or smoke more heavily. SIMPLE, EASY SETUP! The DCS System is simple to hook up. You’ll have trains running in just minutes using the handheld or the App! Each WTIU Fixed Input Channel can handle either AC or DC power. You  can even mix and run one channel with DC power and the other with AC.  This makes it easy to run HO Proto-Sound 3.0 equipped trains using the  same WTIU you use to run all other Proto-Sound 2.0 or later locomotives. Each WTIU Variable Input Channel accepts AC or DC power from  virtually all AC or DC power supplies, including all M.T.H. AC  transformers like the Z-4000, Z-1000, Z-750 and Z-500. Once you’ve got power into the TIU, run the outbound channels  directly to the track or to a terminal block for larger layouts. We  recommend wiring the channels to the track in 15’ sections to best  distribute power and the DCS digital signal. 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