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Grand Canyon Railway

Steam trains have been taking visitors from Williams, Arizona, to the rim of the Grand Canyon since 1901. But it’s only been since 2008 that these historic steam engines have been converted to run on chip fat rather than diesel.

The work has been carried out by railroad company Xanterra.

As well as using recycled vegetable oil, the company harvests 90,000 gallons of snowmelt and rainwater each year to produce steam in its veteran engines.