Pennsylvania Railroad S2

The Pennsylvania Railroad S2 was a one-off experimental steam turbine locomotive, number 6200, designed and built by Baldwin and Westinghouse to prolong the dominance of steam by adapting marine turbine technology. Delivered in September 1944, it was the only locomotive of the 6-8-6 wheel arrangement, with a direct drive turbine geared to the centre axles and a unique quadruple stack. On a test run in 1945 it pulled a 17 car train at 110 miles per hour between Fort Wayne and Chicago, but it was uneconomical below about 30 miles per hour. It hauled prestige trains such as the Broadway Limited on the Chicago to Crestline route, suffered severe turbine damage in 1949, ran 103,000 miles in all, and was retired in 1952 and scrapped the next year.