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As an electronics technician, I have always found that pure DC with feedback works better than pulsed supplies. There are some very simple feed back controller circuits around that use two transisters and a dollars worth of resistors and capacitors. The principle is that feed back compensates for load up hill, and downhill it prevents free wheeling runaway. A great test is to use a quality bench power supply and to vary the voltage from 0-12 volts to control the train. You will be amazed how nicely the train runs. What makes me laugh are the old school modellers who insist their vintage power packs using reohstats are "the best ever made".
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