ALSTOM HAS begun a legal challenge against Transport for London following the award of the Deep Tube contract to Siemens. Fellow bidders Bombardier and Hitachi, who submitted a joint bid, had already announced their intention to challenge the proposed award. TfL announced its intention to award the £1.5 billion contract to Siemens in June. The deal covers 94 new trains for the Piccadilly Line, with the intention of follow-on orders for the Bakerloo, Central and Waterloo & City Lines bringing the total number of trains to around 250.

An Alstom spokesman said: ‘Alstom believe our bid was very competitive and it was based on successful experience of delivering metro trains around the world, including London. Alstom is proud of our successful projects in London, including the maintenance of Northern Line rolling stock. We do not comment on ongoing legal matters.’