My engine is the AF 315 4-6-2. I once had a the AF 336 4-8-4 with the same problem. The engine would run around the whole loop (slow speed) w/o the RU engaging. Solved this like in my previous post above using a bridge rectifier. I wonder if there is a way to add some type of capacitor discharge circuit in the tender to give the RU an extra boost.
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