Since my last thread was highjacked and you know who you are
I figured I'd start a new one. Smoke unit fixed, broken common wire in the engine. So check out the video. As for my comments about the smoke it seems to be getting better weird but comments welcomed.
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That does look like the fan polarity is reversed. That's the first thing I'd try. Normally, the fan should spin clockwise looking from the top.
The smoke looks odd when you start, then starts looking better as you go faster, that's the same thing I've observed with the fan wired backwards. The fan gets a full 5V when it's moving, and a reduced power when stopped, so you should get a more robust puff at slow speed.
FWIW, I normally connect the motor to a bench supply and verify which should be the positive terminal and then mark it with a red mark. Then when I'm wiring, there's no doubt where to connect the positive lead.
TAS Turbo smoke units are marked with a white dot but who knows if that is correct. Easy to swap wires and try again. Next video will be of the Hudson pulling the New England section of the 20th Century Limited
I've found the white dot is not always positive, AAMOF, on two MTH smoke units, one was and one was not.
turned out not to be reversed wires but a fan spinning freely on the motor shaft. Works fine when it's at a constant speed but when John's board is pulsing it, the fan was lagging behind the motor. Small drop of super glue and I'm good to go. Video coming shortly.
Here you go all done. Comparison to the new and EOB Motherboard driven smoke unit. To be fair the wicking more than likely needs to be changed in the EOB Niagara.
Lookin' good! 
I like the one on the left too, but maybe I'm biased. 
Smoke e'm if ya got e'm ...nice job.
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