The D-Type, 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, and the production units were built during 1927 and 1928.