PRR 3936 and 3937

PRR 3936 and 3937
Power type	Electric
Builder	Altoona Works
Build date	May 1911
AAR wheel arr.	2-B+B-2
Gauge	4 ft 8 1⁄2 in (1,435 mm)
Driver diameter	72 inches (1,800 mm)
Length	64 feet 11 inches (19.79 m)
Width	10 feet 6 inches (3.20 m)
Height	14 feet 8 inches (4.47 m)
Locomotive weight	313,000 pounds (142,000 kg)
Electric system	600 V DC
Current collection method	Third rail
Top speed	80 mph (130 km/h)
Power output	4,000 hp (3,000 kW)
Career	Pennsylvania Railroad, Penn Central
Class	DD1
Current owner	Pennsylvania Historical and Museum Commission

DD1 Electric Locomotive No. 36
U.S. National Register of Historic Places
Location:	Railroad Museum of Pennsylvania
Coordinates:	39°58′56″N 76°9′40″W / 39.98222°N 76.16111°W / 39.98222; -76.16111Coordinates: 39°58′56″N 76°9′40″W / 39.98222°N 76.16111°W / 39.98222; -76.16111
MPS:	Pennsylvania Railroad Rolling Stock TR
NRHP Reference#:	79002266[1]
Added to NRHP:	December 17, 1979

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 are semi-permanently coupled together and were assigned an EZN of 36. 3936 and 3937 are only surviving locomotives of its class and were listed on the National Register of Historic Places in 1979.^[2]

History

The DD1-class of locomotives was developed in 1910 to operate in the tunnels under the Hudson River between New Jersey and New York City. The DD1 consisted of, essentially, two 4-4-0 locomotives coupled back-to-back and were never run separately.^[3] Each pair, in addition to individual serial numbers, was also assigned an "Electrofied Zone Number" (EZN) to simplify the dispatching and keeping of mechanical records of the locomotives.^[3]

3936 and 3937 were built in 1911. They were shifted from mainline passenger duty in 1924 when the L5 was introduced, but would still haul the empty passenger trains from Penn Station to the Sunnyside Yard. 3936 and 3937 were donated to the Railroad Museum of Pennsylvania in Strasburg, Pennsylvania, by the Pennsylvania's successor Penn Central, in December 1979.^[4] Both locomotives were jointly listed on the National Register of Historic Places on December 17, 1979.^[1]

See also

• National Register of Historic Places listings in Lancaster County, Pennsylvania

References

1. ^ ^{a b} "NPS Focus". National Register of Historic Places. National Park Service. http://nrhp.focus.nps.gov. Retrieved March 20, 2010. 
2. ^ Hart and Zacher 1978, § 7, p. 4.
3. ^ ^{a b} Stauffer 1962, p. 249.
4. ^ "Motive Power Roster" (PDF). Railroad Museum of Pennsylvania. http://www.rrmuseumpa.org/about/roster/locomotiveroster.pdf. Retrieved March 20, 2010. 

Sources

• Hart, George M; Susan M. Zacher (March 1978). "Pennsylvania Railroad Rolling Stock Thematic Resource" (PDF). National Register of Historic Places Inventory—Nomination Form. http://pdfhost.focus.nps.gov/docs/NRHP/Text/64000729.pdf. Retrieved March 11, 2010. 
• Stauffer, Alvin W (1962). Pennsy Power. Carrollton, OH: Standard Print & Publishing. LCCN 62-20878.