Hi myhku211, welcome :welcome1:to the Gauge.
If you want to run two trains at the same time, on the same track, in different directions, there are two ways to do it. You can use DCC (Digital Command Control), which will also let you do a lot of other stuff, and for more information on that, check out the
DCC Forum .
The other way is to reverse the wiring to the motor of one of your locos.
If you merely want the train to run in one direction, then reverse, running back and forth without having to sit there and control it, there are automatic reversing units available. I'm not sure where you'd find them: perhaps someone else can offer some tips.
Wayne