Tags: Locomotive.

The Pennsylvania Railroad’s class I1s steam locomotives were the largest class of 2-10-0 Decapods in the United States with 598 built 1916–1923 (Altoona: 123 Baldwin: 475). They were the dominant freight locomotive on the system until World War II and they remained in service until the end of PRR steam in 1957. Nicknames for the type included Decs and Hippos the latter due to the large boiler.

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