The most advanced set of features ever designed into a train control. Includes Accutec Technology...Throw a switch, turn on a town full of lights, challenge a steep grade and your loco responds prototypically. Constantly monitoring feedback from the layout, Accutec Technology detects sudden changes in load and instantly compensates for the new demand by delivering the power needed to sustain a realistic reaction without a drop off in power. Accutec Technology enhances slow speed control, power output and other control characteristics. Runs HO, N, TT, Z and other DC scales. Two tech 4 units in one housing to control two trains in different blocks with common rail. Can easily run 4 HO locomotives.