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I have also used old AT computer power supplies and used an adjustable voltage regulator from radioshack to build an "on the cheap power pack". It supplies constant voltage regardless of load. Works well but limits train speed to 12 volts. But really Tim, DCC rules. I think you should reconsider using it. I have used and played with all three and would never go back to switches and block systems. Spend your rescources on automating dcc if you are so inclined.
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