1930s Chicago Pneumatic 225 HP Engine Running

This engine was used by the Arizona Power Company to generate electricity. How often they used it, I am not sure, but I believe this was some sort of supplemental power for the grid.
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[@SchnelleKat]

RIP Don, That guy was Built Like my grandfather the Breed of Real men!! Great to hear that Farmall just roaring away.

[@unigrampa]

I'm extremely grateful I got to see him run this machine in person