I don't know my left from my right

[brubakes]

Okay, when the NMRA refers to left and right on wiring up DCC from the command control to the track how do I know which is left and wich if right?

 

[ThoroughBreed]

This is in reference to wiring up decoders inside an engine:
With the shell off the engine, put it facing away from you so that you are looking at the rear of the engine, now the left is the conductors side on the left and is the side you would hook up the black wire to. The right side is the engineers side and you would hook up the red wire to. Now you want to run the gray wire to the side of the motor that the black would have normally contacted, and the orange to the side the red would have. The rest of the wiring on a decoder is for lighting.

As per hooking up the DCC control unit, I really don't think it matters which side you hook up to the rails from the control unit. As DCC is almost an ac signal, only the decoder knows which way is forward.