The C Stock was built for the Metropolitan District Railway in 1910. The additional rolling stock was required to increase the frequency of the service (particularly given the introduction of automatic electro-pneumatic signalling which allowed less headway between trains), plus the four-tracking of the section west of Hammersmith which allowed a greater frequency of trains to and from Richmond. The C Stock remains the only fleet of London Underground carriages to have been built in Scotland. No vehicles have survived into preservation. In appearance they were similar to the B Stock.