Pennsylvania Railroad (PRR) 5507 - Altoona 4-4-4-4

Here is a photo by an unidentified photographer that was taken in Chicago, Illinois, in July of 1946. Shown here is Pennsylvania Railroad engine #5507, a T-1 (4-4-4-4) "Duplex" built in Juniata during December of 1945 and retired in December of 1953 after just eight years of revenue service. Brad Mann Collection.

This unique experimental 4-4-4-4 wheel configuration was built by the PRR's Altoona Shops in 1945. It lasted 8 years before being scrapped in 1953. According to Wikipeida, tje T1 duplex drive 4-4-4-4 steam locos were ambitious, technologically sophisticated, powerful, fast and distinctively streamlined by Raymond Loewy. However, they were also prone to wheelslip both when starting and at speed, in addition to being complicated to maintain and expensive to run. Partial specs - T-1 class, 80" drivers, 300 psi,massive engine weight of 502,200 lb, tractive effort 64,653 lb,

Portraits 10. Here is a steam locomotive portrait of Pennsylvania Railroad engine #5507, a T-1 (4-4-4-4) "Duplex" built in Juniata during December of 1945 and retired in December of 1953 after just eight years of revenue service. The photographer's name, the exact date, and the location are not recorded. (#65 of 72)