The largest locomotive in the terms of horsepower where the Union Pacific GTELs -- Gas Turbine Electric Locomotive, delivered 1958-1961. They where first rated at 8,500 HP, but certain altitudes where able to put well over 10,000 HP. Built by General Electric, they where the third generation of the gas turbines. Call the Big Blows, they where in a two piece set, or A/B with a dedicated tender which gave them an over all length of about 165 feet long. While they had the most powerful prime mover in the United States, the UP also had the an experimental coal turbine/diesel that had an over all length of 214 feet, but produced only 7000 HP, however it was deemed a failure and was scrapped in 1968.
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