Future Replacement
The 1973 Stock was scheduled to be replaced in 2014 by a new build of trains, but the tender for this project was cancelled in 2010 before any company had bid for the work.
Subsequently, London Underground invited Alstom, Bombardier and Siemens to develop a new concept of lightweight, low-energy, semi-articulated train for the deep-level lines, provisionally called "Evo" (for 'evolution'). So far only Siemens has publicised an outline design, which would feature air-conditioning and would also have battery power enabling the train to run on to the next station if fourth-rail power were lost. It would have a lower floor and 11% higher passenger capacity than the present tube stock. There would be a weight saving of 30 tonnes, and the trains would be 17% more energy-efficient with air-conditioning included, or 30% more energy-efficient without it. The intention is that these new trains would replace the 1973 stock, as well as the 1972 stock of the Bakerloo line.
Read more about this topic: London Underground 1973 Stock
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