from Clapham Common to Morden in 1923, as well as incorporating the City and South London Railway, which had been rebuilt with larger tunnels. 191 cars were ordered from three manufacturers in 1923, which were formed into five-car trains. The City and South London Railway had been built with tunnels which were only in diameter, and had used small electric locomotives to haul trailer cars, until it closed for rebuilding in 1923. The reconstruction was completed in 1925, and 69 of the new vehicles were owned by them, while the rest were owned by the London Electric Railway Company. In a departure from previous practice, where all traction control equipment had been supplied by British Thomson-Houston (BTH), most of the batch were fitted with equipment by Metropolitan-Vickers, which consisted of electro-magnetic contactors arranged to manage the acceleration of the train automatically, with switching from series to parallel connection of the motors handled by bridging them rather than open-circuiting them. Two motor cars had equipment by General Electric Co (GEC), which worked similarly, and was required to work in multiple with the Metropolitan-Vickers equipment. All the vehicles used a C-type door operating engine, which proved to be a poor design. Another 127 cars were ordered in 1924, with most of the motor cars and some of the control trailers using GEC equipment. Cars with GEC controls used WT54 motors. Those with Metropolitan-Vickers equipment used MV152 motors, and although they were interchangeable in theory, in practice they were always kept in pairs. The 1924 cars were fitted with a D-type door engine. This was reclassified as a DL-type after a minor modification had to be made. It proved much more resilient than the earlier C-type, and was used on all Standard Stock until 1931. Delivery of the cars was not easy, as the Hampstead Line did not have a mainline railway connection to any other line. The bodies and bogies were delivered by road, and two large gantries were erected at both the Morden and Golders Green depots. A traction engine would arrive at the site with the body, and would position it below the gantries. It would then be raised so that the road wheels could be removed, and a steam crane would position the bogies onto the track. Once the body and bogies were united, a steam engine would remove the complete car, to allow the next one to be