Say I buy some king of dcc system, could I hook up two or more locomotives and control all of them by controlling only the speed of the lead locomotive? Like hooking up multiple units in the real world... Is it possible? What system should I buy to accomplish this? Thank you! Brandon

I just purchased a Genesis F7 (A and B units), DCC and sound. A really neat engine. However, I cannot seem to run both together. The engine runs very well, but, when I attach the second unit, it seems that the second unit is "dragging" down the engine. I know I have overlooked something, but...