Mrcs Prodigy Dcc Is Engineered To Let Most Railroaders Operate Multiple Locos On One Layout By Following The Quick Start Instructions On The Handheld Controller. You Can Control Multiple Locos On The Same Track, Going At Different Speeds, In Different Directions. This Accessory Automatically Change Polarity Of Your Reverse Loop Or Reversing Section. Easy 4-Wire Hookup. Not For Use On Non-Dcc Layouts Or With Nondecoder Equipped Locomotives.