I think you know the problem. 2/3 rail engines have poor outside rail pick-ups period. I think the left side of the engine drivers and the right side of the tender(anyway something like that pick up the outside rail.. We have the same problem running a 2/3 engine lite over a long crossover.... The answer might be an additional relay to power common on the insulated section . Adding a car might help but. Not very good railroading IMHO. I don't know what the fix is??
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