I have a shelf layout that will be used to run only LionChief engines. I want to power the track directly with an 80 Watt transformer (6-14003). I see no need in using the adjustable voltage handle unit/ nor do I want to use it. If I remove the barrel plug from the output of the transformer, should I be concerned with what wire goes to the center and outside rails? Presently, (I guessed ) I am using the wire with a white strip as the outside rail. I am have no problem with the engine responding to all commands. Should I use a multi-meter and determine which wire is the outside of the barrel plug and what is the inside? Since LionChief can work in either DC/AC environment is polarity an issue in this case?