D-type Triplex (New York City Subway car)

D-type "Triplex"
D-type "Triplex"
	A two-unit train of D-types on the BMT Brighton Line in June 2015
	Interior of D-Type unit 6095
In service	1925–1965
Manufacturer	Pressed Steel Car Company
Constructed	1925, 1927–1928
Number built	121
Number preserved	31/3
Number scrapped	1172/3
Successor	R27; R30; R32
Formation	Three-section articulated units
Fleet numbers	6000–6120 A-B-C
Capacity	555: 160 (seated), 395 (standing)
Operators	Brooklyn–Manhattan Transit Corporation; NYC Board of Transportation; New York City Transit Authority
Specifications
Car body construction	Steel
Car length	A and C units: 45 ft 4+1⁄2 in (13.83 m); B units: 38 ft 11+3⁄4 in (11.88 m); Total: 137 ft 3 in (41.83 m)
Width	9 ft 10+15⁄16 in (3,021 mm)
Height	12 ft 1+3⁄4 in (3,702 mm)
Floor height	3 ft 1+1⁄8 in (0.94 m)
Doors	12
Articulated sections	3
Maximum speed	45 mi (72 km) per hour
Weight	207,600–213,600 lb (94,166–96,887 kg)
Traction system	Westinghouse 143 or GE PC-15 propulsion system, using GE 282D motors or Westinghouse 584 motors (200hp each). 4 motors per car (1 per truck).
Power output	200 hp (149 kW) per traction motor
Electric system(s)	600 V DC Third rail
Current collector(s)	Top running Contact shoe
UIC classification	Bo’Bo’+Bo’Bo’+Bo’Bo’
AAR wheel arrangement	B-B+B-B+B-B
Coupling system	WABCO H2A
Track gauge	4 ft 8+1⁄2 in (1,435 mm)

The D-Type,^[1] commonly known as the Triplex, was a New York City Subway car class built by Pressed Steel Car Company. They were operated by the Brooklyn–Manhattan Transit Corporation (BMT) and its successors, which included the New York City Board of Transportation and the New York City Transit Authority (NYCTA). The fleet consisted of 121 cars, each arranged as three-section articulated units. Four units were built as a prototype in 1925,^[2] and the production units were built during 1927 and 1928.

The D-types were the first articulated rapid transit rolling stock used in the United States, and were followed by several more articulated trains until the BMT sold all of its transit operations to the City on June 1, 1940. First placed into service in 1925, they operated primarily on the BMT's Southern Division, although they would also appear on many other parts of the subway system. The R27s, R30s, and R32s slowly replaced the triplex cars, which last ran on July 23, 1965. Three sets and a section were preserved, and the rest were scrapped.

^ Gene Sansome (2004). New York Subways: An Illustrated History of New York City's Transit Cars. The Johns Hopkins University Press. ISBN 0-8018-7922-1.
^ Cadahy, Brian (1995). Under the sidewalks of New York: the story of the greatest subway system in the world. Fordham University Press. p. 89. ISBN 0-8232-1618-7.

[1] Gene Sansome (2004). New York Subways: An Illustrated History of New York City's Transit Cars. The Johns Hopkins University Press. ISBN 0-8018-7922-1.

[2] Cadahy, Brian (1995). Under the sidewalks of New York: the story of the greatest subway system in the world. Fordham University Press. p. 89. ISBN 0-8232-1618-7.

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