Finding shorts can unfortunately be hard sometimes and is often a process of elimination. As mentioned by Scott, making sure all the wheelsets are installed correctly is a good place to start. Sometimes using two alligator clips hooked up to your power source (and touching one wheel on each side) can help narrow things down. Or putting the engine on the track and putting a piece of paper under one of the trucks (or even individual wheels) can help narrow things down. Other things to look for is there anything touching a wheel (like a brake shoe) that should not be touching it.
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