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Pennsylvania Railroad 5550
PRR T-1 class 4-4-4-4 locomotive under construction
Pennsylvania Railroad 5550
Pennsylvania Railroad 5550, named Dave Fink, is a mainline duplex drive steam locomotive under construction in the United States. With an estimated completion by 2030, the locomotive will become the 53rd example of the Pennsylvania Railroad's T1 steam locomotive class and the only operational locomotive of its type, as well as the largest steam locomotive built in the United States since 1952 and the only existent duplex locomotive in the world. The estimated cost of PRR 5550 Dave Fink was originally $10 million, but an updated projected cost of $7 million was released with the acquisition of an existing long-haul tender from the Western New York Railway Historical Society in August 2017. Construction began in 2014 with the casting of the locomotive's keystone-shaped number plate. As of May 2026 the locomotive is 65.4% complete. The T1 Trust, the nonprofit constructing the locomotive, has so far completed all 8 driving wheels as well as the boiler, cab, keystone, frame and the cylinders.
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