| Alco's S2 -- a 1,000 horsepower B-B switcher built between 1940 and 1950 -- was a successful follow-up to Alco's 600 hp S1. Penn Central owned a lot of them because each of its constituent railroads, the New York Central, Pennsylvania, and New Haven, were good S2 customers. In 1971, S2 #9606 -- a former NYC unit -- pulls a heavy-duty crane towards New Haven on the 4-track mainline at Rye, New York. Ektachrome by Stephen \. Baldwin. |