My Son and I both have an older 6-28051 TMCC EM-l. His does not some hardly at all. And my smoke unit motor pulses. I tested both the smoke unit motor's with a 9 volt battery plugged directly to the motor plug itself. Motor ran good,fan turned good. So I replaced the smoke unit resistor board with a new one. His still hardly produces any smoke. And mine still pulses. I feel that I ruled out the smoke units themselves. So what could be causing the smoke units not to work properly. The rest of the locomotives and tender functions seem to work properly.
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