It was subsequently absorbed into the London Underground Q Stock.

A complete review of District line rolling stock was carried out in 1926, leading to the withdrawal of further B Stock cars and their replacement, plus additional rolling stock to increase frequencies.

[1] This led to the construction of the 101 motor cars of clerestory roofed K Stock.

[1] As built, the cars had hand-operated sliding doors.

The doors were converted to air operation, and electro-pneumatic brakes added in 1938 as part of the Q Stock project.