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This was by far one of the coolest mutant vehicles I've ever seen. It was a giant walker driven by (my best guess) a tractor engine...something with a huge amount of torque. The engine would rev and the thing would take a step forward. It moved pretty slowly, but so interesting to watch.

 

To turn, there was a center leg that the driver would lower to raise the other legs off the ground. Then everyone would get out and push on the corner which would turn the walker as it pivoted on the center leg. It looked a little sketchy, but it worked.

Done