What's the purpose of this exhibition? One might as well try pulling a D2 Caterpillar with an Indy race car. It's a demonstration of traction, and heavier will always win, regardless of power.
It's true that the steam engine has an edge at very low speed because that's where it has maximum torque. But I'm sure that drag tractor is capable of putting out much more torque to its wheels than the steamer, it just can't hold it.
You'll notice that the drag tractor is careful to keep his wheels spinning. If he just stopped and held his brakes, the engine would have a much harder time pulling him.
The comparison made between this demononstration and a aircraft carrier catapult is silly. The catapult can accelerate an aircraft weighing several tons from zero to 100 mph in only a second or two. That's serious horsepower. The steam engine, in comparison, is putting out only a few horsepower as it drags the tractor backwards.
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