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Just a thought, but I once helped someone in my LHS who had this same problem - they hadn't realised that if you're running two seperate circuits of track you need a power feed to both of them. For each loop of track you will need an extra controller unit (under conventional DC control anyway) if trains are to be run seperately. You also need to make sure you have no "dead spots" - I had to add a few extra feeds to my end to end layout as in certain situations no power would reach the loco. I'm contemplating adding another to solve irritating voltage drop problems caused by dirty switch blades. Hope this helps! <br /> <br />PS. Just had another thought. I operated a twin-track test loop using a Gaugemaster D power unit. This has a slider switch to change direction, and I found that if you set the track switches to change from one loop to the other (but didn't make sure to set both direction switches on the power pack the same way) the train wouldn't run due to a short. Luckily modern power units have auto circuit breakers to stop any damage occurring! This might also cause similar problems.
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