The Pennsylvania Railroad’s class S2 was a steam turbine locomotive. One was built #6200 delivered in 1944. The S2 was the sole example of the 6-8-6 wheel arrangement in the Whyte notation with a six-wheel leading truck eight driving wheels and a six-wheel trailing truck. The S2 used a direct-drive steam turbine; the turbine was geared to the center pair of axles with the outer two axles connected by side rods.
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