The G Stock were 50 electric multiple unit train carriages built for the District Railway in 1923 by Gloucester RC&W.

[1] They operated on the District line of the London Underground until 1971 (with most cars being withdrawn in the early 1960s).

The G Stock consisted entirely of motor cars, all built with a clerestory roof similar in style to the B Stock with which they would work.

[2] A major part of the Q Stock project was the replacement of the potentially dangerous manually operated sliding doors (which could be opened by passengers between stations) with air operated doors controlled by the guard.

The majority of the cars were withdrawn in the early 1960s as CO/CP Stock trains transferred from the Metropolitan line started to become available.