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I recently saw an episode on the History Channel2 on, I do believe it was Modern Marvels. It started as a steam shovel on the railroad tracks for digging hillsides to further the railroad. They would dig and then lay more track. Then I do believe a company in Erie, PA eventually installed steel tracks over the railroad "wheels"to make it more mobile and not limited to only being on the railroad tracks. Hope this helps you

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12y ago

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