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<p>My favorite steam locomotive is the PRR's K4 Pacific.  It was the last active duty steam locomotive that I rode behind, and I have several pictures of K4s in my den.  Moreover, I was born and reared in Altoona, Pennsylvania, just a stones throw or two from the Juniata Shops where the K4s were built.    </p> <p>I am not a technical guru.  So here is my question to the techies.  What were the pros and cons of the K4?  </p>
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