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Vic, More than likley the output of your xfr (transformer) is DC. You have to look at the terminals to determine if there is a deliniation of DC v. AC. If there is no such marking on the terminals or the side of the xfr look on the bottom for a diagram. Lest there be no marking or diagram you will need a Volt/Ohm meter to accurately determine AC v. DC. I would very much suspect the output to be DC though. An easy way to keep polarity on the rails is to follow the wires from each terminal to each rail and confirm both. If the '+' terminal is on the inside rail closest to you it should be connected to the inside rail accross from you. Be careful with electricity if you are not familiar with it, or know how it is transmitted. As an aside, most xfr's have both AC/DC outputs. Mainly DC is for Engine, (track), power and AC is for accessories. Again, if you are not completely comfortable with your xfr, get a VOM and read the instructions that come with it. A VOM is an indespensible tool when it comes to modeling Trains. I hope this reply isn't too convolouded for you. Regards and Good Luck, John Newton
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