The Pennsylvania Railroad T1 was a class of duplex drive 4-4-4-4 steam locomotives built for the Pennsylvania Railroad, with two prototypes completed in 1942 followed by fifty production examples in 1945 and 1946. Streamlined by the industrial designer Raymond Loewy and among the last steam locomotives the railroad ever built, the class proved fast but troubled in service, suffering persistent wheelslip and high maintenance costs that helped push the Pennsylvania Railroad toward full dieselization by 1948.
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Sources
1. Pennsylvania Railroad class T1 (Wikipedia)
Lead
introduced in 1942 with two prototypes
In Group: American Main-Line Steam Locomotives, Lead sentence
The Pennsylvania Railroad (PRR) class T1 duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 with two prototypes and later in 1945-1946 with 50 production examples, were the last steam locomotives built for the PRR and arguably its most controversial.
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