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S1 of the Pennsylvania Railroad. Wheel arrangement 6-4-4-6, with seven foot driving wheels. It was an attempt to reduce the weight of rotating parts on a standard eight coupled locomotive by having two sets of four coupled wheels and two separate sets of cylinders. It was longer than a Big Boy, but was not articulated. The rigid frame made it hard to negotiate tight curves in rail yards. It couldn't access their Chicago terminal for that reason.Sigourney Weaver doesnt like this train
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It was super fast, but slippery. Longer that a Big Boy. It was a one off, but paved the way for Pennsy's legendary T1 (below).
This photo is when it was on display at the World's Fair, with the wheels slowly rotating on rollers.