The D Stock was built by Metropolitan Amalgamated Railway Carriage & Wagon in Saltley, England for the District Railway in 1912. A total of thirty cars were built, twenty-two were driving motor cars and eight were trailers. In 1928 the eight trailer cars were rebuilt into motor cars at Acton Works.

D Stock
In service	1912–1958
Manufacturer	Met Cammell
Specifications
Car length	49 ft (14.94 m)
Width	8 ft 9+1⁄2 in (2.680 m)
Height	12 ft 3+1⁄4 in (3.740 m)
Weight	33.16 long tons (33.69 t; 37.14 short tons)
Seating	48
Notes/references
London transport portal

These units were very similar to the earlier B and C Stock trains. In the 1940s the C, D and E stocks were reclassified as "H Stock" (signifying hand-operated doors), along with other pre-1938 District Line rolling stock that had not been converted to have air-operated doors. The H Stock was largely eliminated by the early 1950s, following replacement by R Stock. The remaining cars were largely confined to the Olympia shuttle service and were withdrawn from passenger service by the late 1950s. One continued in use for a time in grey livery as a "Stores Carrier" motor car SC637, before being finally broken up in May 1963.^[1][2][3] No vehicles have survived into preservation.