Thank you very much. This really helps me. I chose this larger BC to slow the engine between 2 and 3 volts based on several past posts on smoke unit improvement. At present, both smoke and whistle operate anemically at maximum 11 volts operating speed. If I increase the transformer to improve both, the engine will fly off the tracks. I even took your recommendation and installed a 20-ohm smoke resistor from Digi-Key. It helped but the whistle remains weak at present operating voltage. Again, thank you.
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