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.
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