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I think you're probably whistling in the wind.  If you added traction tires, you'd only have two wheels in contact with the rails, power dropouts would be a major factor, especially if you use insulated rails for signaling.  When I converted a couple of RMT BEEP locomotives to TMCC, one of the things I did was get rid of the traction tires as they caused the little guy to stall on almost every switch.

One possibility is to cut grooves across the wheels.  I have a little MTH 0-4-0 that I also converted to TMCC, and it has grooves.  It makes it noisy, but it's able to pull a dozen boxcars up a 2% grade, not to shabby for four wheels with no traction tires.

I managed to pull three Menard's boxcars with mine, that was it's limit.  With four, it was just spinning it's wheels.  Menards boxcars have more rolling resistance than modern cars with needle-point axles, so it's probably possible to pull five or six of those.  I was able to pull one MTH Premier Amtrak Superliner, but two was a no-go.  Personally, I'd stick to one or two boxcars or equivalent, as Mitch says, the motor is a really tiny one, and they aren't the most robust motors on the planet.

True, with one or two cars, you shouldn't need traction tires.  I don't see this guy operating on any grades, I'd be pretty careful trying to increase it's traction too much.

FWIW, just as a test, I added a chunk of lead (a bit over 1 pound) on top, and it made a huge difference.  However, I don't have any plans to try to enhance it's traction, it's good enough the way it is for me.

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