TitleThree wheels on the track
CommentTo increase speed, decrease friction. Most of the friction occurs between the wheel, the axle, and the track.
So raise one of the front wheels slightly. Insert the axle at a very slight upward angle so tha the wheel is a millimeter or two above the track. The wheel needs to be low enough that it will still contact the track runner underneath the car (and thus stay straight on the track.)
The car will balance easily on 3 wheels, and you will have 25% less friction to overcome.
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