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| BMT Triplex | |
|---|---|
| Name | BMT Triplex |
| Manufacturer | Brooklyn Rapid Transit Company |
| Year | 1920s |
| Operator | Brooklyn–Manhattan Transit Corporation |
| Locale | New York City |
BMT Triplex The BMT Triplex was a family of articulated New York City Subway subway cars built for the Brooklyn–Manhattan Transit Corporation in the 1920s and operated on lines including the BMT Broadway Line, BMT Nassau Street Line, and BMT Fourth Avenue Line. Designed during the era of rapid transit expansion under figures such as August Belmont Jr. and companies like the Brooklyn Rapid Transit Company, the Triplexes reflected contemporary trends in articulated rolling stock pioneered by builders such as the American Car and Foundry Company and operators including the Interborough Rapid Transit Company and Independent Subway System. Their introduction intersected with urban projects like the Dual Contracts and civic developments involving the New York City Board of Transportation and the Public Service Commission (New York).
The Triplexes emerged amid competition between the Brooklyn Rapid Transit Company and rivals like the New York City Transit Authority predecessors, influenced by precedents from the London Underground and Paris Métro articulated units. Procurement decisions involved firms such as Westinghouse Electric Corporation, General Electric, and Pullman Company, and were shaped by transit debates involving officials like John Hylan and planners linked to the New York City Subway expansion (1913–1925). Their service life overlapped with events including the Great Depression, World War II, and postwar modernization under agencies like the New York City Transit Authority and the Metropolitan Transportation Authority.
Triplex cars used articulated three-section sets with design influences traceable to the St. Louis Car Company, Baldwin Locomotive Works, and European articulations such as the London 1938 Stock. Each set combined motor and trailer units, employing electrical equipment from Westinghouse Electric Corporation or General Electric Company (GE), and braking systems akin to those used by American Brake Company suppliers for the Interborough Rapid Transit Company. Structural features echoed work by Subway Rapid Transit Company-era engineers and adopted steel construction used by Pullman and St. Louis Car Company projects. Dimensions, wheel arrangement, traction motors, and control gear were specified to suit loading gauge constraints of tunnels beneath landmarks like Manhattan Bridge, Brooklyn Bridge (New York City), and stations rebuilt during the Dual Contracts program. Interiors referenced standards set by the Open Gangway concepts and bench seating common to Lesseps-era designs, while signaling compatibility considered systems employed on the BMT Brighton Line and BMT Sea Beach Line.
Over their lifespan, Triplex sets received modifications paralleling alterations made to contemporaneous fleets such as the IRT Composite and R11 (New York City Subway car) experiments. Upgrades included electrical retrofits by firms like Westinghouse and General Electric, lighting and heating changes reflecting standards from the Postwar Transit Modernization programs, and structural reinforcement reminiscent of conversions undertaken by the St. Louis Car Company for other operators. Some sets were modified for trials with multi-unit train control similar to tests by the Brooklyn–Manhattan Transit Corporation and innovations pursued by the New York City Transit Authority and Transit Museum (New York). Operational adjustments paralleled fleet standardization efforts linked to orders such as the R32 (New York City Subway car) and R42 (New York City Subway car), though Triplexes remained distinct in articulation and coupling.
Triplex cars operated on BMT services that connected with routes serving terminals like Coney Island–Stillwell Avenue, Times Square–42nd Street, and Atlantic Avenue–Barclays Center (Atlantic Terminal). They ran through periods of change involving the City of New York takeover of the BMT, coordination with the Interborough Rapid Transit Company and Independent Subway System before unification, and later administration by the New York City Transit Authority and Metropolitan Transportation Authority. Their operational record paralleled incidents and events such as signal modernizations, tunnel clearances at Montague Street Tunnel, and service reorganizations exemplified by changes on the BMT Brighton Line and BMT West End Line. Retirement of the Triplexes occurred amid fleet renewals influenced by newer types like the R44 (New York City Subway car) and R46 (New York City Subway car), and by capital programs associated with officials from the MTA Board and city administrations.
Preservation efforts involved institutions such as the New York Transit Museum, private collectors, and preservation societies comparable to the Railway & Locomotive Historical Society and the New York Railroad Restoration Project. Surviving elements inspired exhibits and comparative displays alongside preserved equipment like the R1 (New York City Subway car), R11, and rolling stock at venues including the Country Museum and rail heritage operations resembling those of the Seashore Trolley Museum. Documentation and artifacts have been curated by archives associated with the New-York Historical Society, the Brooklyn Historical Society, and university collections such as those at Columbia University and New York University, while historical studies cite archival materials from the Public Service Commission (New York) and engineers connected to the Dual Contracts era.
Category:Brooklyn–Manhattan Transit rolling stock