Abstract: A model railroad train control system for supplying power to at least one DCC two-rail operated train engine and/or at least one AC three-rail operated train engine. The train control system used for operating the engines simultaneously and independently on the same railroad track or separate train section blocks making up the track. The control system includes one or more current limited voltage source modules connected to the track for providing modulated voltage to each engine. Each module has two identical channels composed of power transistors for a left track power output and two identical channels composed of power transistors for a right track power output. The outputs rapidly switch, alternately, between ground potential (zero volts) and as high as 48 volts. The transistors provide a return current path for the DCC two-rail engine and the AC three-rail engine. The power transistors are individually current limited and have a response time in a range of 1 to 5 microseconds.