They were not a success, as five of the six had been withdrawn from service by August 1993, while a decision was made about their future, and the sixth was withdrawn some time later. They were numbered L62 to L67, and all were still in store in 2002. Roster Design All locomotives were built to a similar design, but with a number of variations included over the years of development. Numbers L41-L43 had Metadyne control gear. The locomotives have a cab at each end and are built to the standard 'Tube' loading gauge so that they can work over all lines on the London Underground network. They are equipped with buffers and drawhooks, for coupling to standard main line vehicles. Earlier vehicles had hinged buffers, which could be raised upwards when not in use, but this job was arduous, and a programme of replacing them with retractable buffers was carried out. They were also fitted with a 'Ward' coupler, mounted at a height suitable for tube cars, but this made the locomotives prone to significant damage in shunting accidents. In 1980, two locomotives, L18 and L38, were fitted with buckeye couplings, as an experiment. These automatic couplings are mounted at the height of the main frames, and so shunting damage is significantly reduced. The success of the experiment led to buckeye couplings being retro-fitted to all locomotives built from 1964. Additionally, they all have train air-brake equipment. The body sides take the form of louvres to allow ventilation around the batteries, although most locomotives had four solid body panels on one side only. All body panels are hinged to allow the batteries to be removed. Following the withdrawal of steam engines, the vehicles often worked on open sections of line, rather than in tunnels, and the need to heat the cabs in winter became apparent. Draught excluders have been added to all cab doors, and additional heaters have been fitted into the cabs. The original livery was grey, but crimson lake was applied from the early 1960s using supplies of LT steam locomotive paint. This was changed to yellow in the early 1980s, which was deemed to be more safety conscious. Power The locomotives can draw power from the 630 V electrified rails like a normal tube train, or run on 320 V DC traction batteries when the power is switched off. Since most of the traction motors were removed