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PRR 3936 and 3937
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PRR 3936 and 3937, formerly 4781 and 4780 respectively, are a pair of DD1-class electric locomotives located in the Railroad Museum of Pennsylvania in Strasburg, Pennsylvania. The two locomotives form a married pair and were assigned an EZN of 36. The locomotives were put into service in 1911 and operated in the tunnels beneath the Hudson River between New Jersey and New York City until being relegated to yard work in 1924. 3936 and 3937 were donated to the Railroad Museum of Pennsylvania by Penn Central and are the only surviving locomotives of its class. They were listed on the National Register of Historic Places in 1979.
== Design ==
Locomotives 3936 and 3937 consist of two separate DD1-class locomotives semi-permanently coupled back-to-back. Together, the pair have length of and weigh . DD1-class locomotives were nearly always operated as a pair—never individually and rarely as two pairs in a double-heading configuration. The locomotives were assigned an "Electrified Zone Number" (EZN) of 36; the EZN simplified train dispatching for each pair of DD1 while their original individual serial numbers were used for the mechanical records of the locomotives.
Each locomotive had its own Westinghouse 315-A, direct current, commutating pole, electric motors within a monocoque cab. The motors had a continuous power rating of at , and could produce up to at for no more than an hour. The motors were connected to the two drivers via a jackshaft and coupling rods. The design of the DD1 served as a transition between steam locomotives and modern electric locomotives. Despite their ungainly appearance, DD1's ran "quietly and smoothly...with no appreciable rod clanking", and had a very low maintenance cost. DD1 locomotives operated off of 650 volt direct current from a third rail.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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