Image at right is from Brickshelf...
I'm slow. This has been buzzed up already, and I'm late to add my raves. But for the benefit of my paltry readership, if you like LEGO at all, you need to go check this out. Read the LUGNET posting.
Shaun Sullivan of NELUG has built a LEGO based odometer for measuring distance that trains run on exhibition layouts.
Note that an odometer was used at the PNLTC Guinness record attempt but it was electronic.
This one is purely mechanical. It's testimony to Shaun's addiction that he chose to do it this way... but ironically used significant computer time to calculate the gear ratios needed to get to within 8 feet per mile of accuracy in his measurements.
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