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.

PRR DD1 #10 is pulling a LIRR train from within the East River tunnels towards "H" tower where the electric head-end power will be transferred to a LIRR locomotive. - 1910 Archive: Dave Keller

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 DD1 electric locomotives were developed from the prototypes that were tested on LIRR trackage. Later it saw power such as the B3. [2] The LIRR's steam passenger locomotives were modernized from 1901 to 1906, and by 1927, it was the first Class I railroad to replace all its wood passenger cars with steel. [2]

LIRR DD1's with idler car to bridge the third rail over crossings, providing connectivity for the locomotive. Source: eBay. AA-1 depicted above was LIRR's #323 "Phoebe"; the only one built by PRR's Juniata Shops.

Feb 15, 2016 · Pennsylvania RR, DD1 electric, 1911. Taylor Rush: I guess they were actually pretty successful locomotives though. Lasted until 1957 and one of them even survives in preservation today. James Ridgway Jr.: Was actually wire train engine for PRR until the end...Saved by Penn Central, and sent to Strasburg...

Apr 6, 2025 · The Rockaway Division saw joint service with the subway, more was planned, and the first LIRR electrics (MP-41's) were fully compatible, equipped with the special shoe arrangement. When Penn Station first opened, the DD1 electric locomotives were also equipped with small pantographs.

Those electric motors gave the DD1 a potential top speed of 85 mph (137 km/h), though PRR/LIRR timetables never allowed more than 65 mph. Each half-locomotive contained one large electric motor mounted in the body and driving via a jackshaft and side rods.

a DD1 electric locomotive, while not steam, had a 4-4-0 wheel arrangement and was classified accordingly as a "DD" because the units always operated in pairs ("A" and "B" units = 2 "D" units, coupled).

The JoeKorner LIRR page; NYC Subway Org's LIRR page; newdavesrailpix.com; Back: Long Island Railroad. Long Island NY. Forward: DD-1 342 at Long Island City in the late 1940s Caption data from James Mardiguian; photo courtesy the Joe Testagrose collection. Back to …