The Pioneer Steam and Gas Engine Society of Northwestern Pennsylvanias's 40th Annual Show featured a tractor pull. The farther they pull the draggin' wagon sled, the heavier the sled becomes, and the harder it is to pull. The best tractors went about 200 ft pulling 4000lbs. 
There's some history of oil drilling in this area too, so we saw some steam powered engines used for oil wells and farming. I tried to video an old gear mesh from on of these machines but a funny thing happened between the rotational speed of the gear and the sample rate of the video camera, and it looks like the gear is staying still, unless you watch the dot on the side of the gear rotate. You can hear the steam cylinders puffing away.
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