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First of all, let's get our terminology in line here. There is, by definition, no such thing as a DC transformer. Transformers are used to step AC voltages up or down depending upon the intended usage. If the device is made for model train usage, plugs into the wall (120VAC)and puts out DC voltage for the trains it is A POWER PACK. Within it's case is a TRANSFORMER which steps the 120VAC out of the wall down to some safer voltage level. Then a RECTIFIER converts that lower AC voltage to DC. From the output of the rectifier the voltage goes to the terminals on the outside case of the device. If it also has AC terminals on the case, they are fed directly from the transformer without being rectified. If it's an old TYCO power pack it's not likely to be too much for the trains. Tyco never was a giant in the quality arena. You would be better off many times over by investing in a good quality unit from MRC for running your trains. It sounds like you have a sentimental attachment to this old power pack. Nothing wrong with that. Plug it in, hook it up to the rails and see how it does. I still think a newer unit from a good manufacturer like MRC will serve you better, but you could keep the old Tyco unit around just to keep it around. A lot of modelers have similar things from their younger years on display in their layout rooms, etc. Above all else, enjoy the hobby! Cheers, Ed
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