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A Basic Question About Current/Volts...

So I've been using this unit to run my stuff, and have been very happy with it:

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...but since we're approaching that time of year for memories and nostalgia, I thought I'd break out this old thing and use it:

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Here's my question:

When I run one of my modern-era steamers with the MRC unit, it'll run at a given speed at approx 4-5 volts, and the smoke output is "okay": If I then hook up the AF unit and run the same engine at the same speed, it takes about 8-9 volts so the smoke output is much greater.

It seems to me that the engine would run almost twice as fast on almost twice the volts, but that's not the case. The only noticeable difference is in the smoke output. Is this because the old American Flyer unit is just inherently less efficient? 

I know in the over-all scheme of things, this doesn't matter; I'm just curious... 

Mark in Oregon

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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