PRR DD-1 GHB
The Pennsylvania Railroad DD1 was a class of boxcab electric locomotives built by the Pennsylvania Railroad. The locomotives were developed as part of the railroad's New York Tunnel Extension, which built the original Pennsylvania Station in New York City and linked it to New Jersey via the North River Tunnels. The Pennsylvania built a total of 66 locomotives in its Altoona Works; they operated in semi-permanently coupled pairs. Westinghouse supplied the electrical equipment.
Each semi-permanently coupled pair had a length of 64 feet 11 inches (19.8 m) and weighed 313,000 pounds (142,000 kg).[1] DD1-class locomotives were nearly always operated as a pair—never individually and rarely as two pairs in a double-heading configuration. The PRR classed their 4-4-0 locomotives as class D, and the DD1 was essentially two 4-4-0 locomotives coupled back to back, resulting in the new class, DD. Each pair was assigned a single "Electrified Zone Number" (EZN); the EZN simplified train dispatching for each pair of DD1s 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 1,580 horsepower (1,180 kW) at 58 miles per hour (93 km/h), and could produce up to 2,130 horsepower (1,590 kW) at 38 miles per hour (61 km/h) for no more than an hour. Their top speed was 85 miles per hour (137 km/h), but PRR/LIRR timetables had a speed limit of 65 miles per hour (105 km/h). The motors were connected to the two 72-inch (1,829 mm) 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, DD1s 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.
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