A number of 1940s and 50s Union Pacific test reports and test-related documents were recently posted on the Utah Rails website. They were papers from the collection of Paul Flebbe, the Union Pacific Engineer of Road Tests in the late 1940s, when the railroad was still evaluating steam locomotive performance. I came across this link on Facebook yesterday and haven't gone through everything, but it is quite a new discovery for those interested in steam locomotive engineering and test data. Not much technical test data on modern UP steam locomotive types has ever been published.
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