deep tube lines.' The deal for the sub-surface lines, which include the Circle, East London, Hammersmith & City and Metropolitan lines, is expected to be easier to price.
A short list of four or five groups will be invited to bid by LU in the spring.
But LU will not replace the consortium which recently pulled out of the £2.3 billion deal to revamp the Bakerloo, Central, Victoria and Waterloo & City lines.
LU received a letter from Siemens-led NewMetro on Monday explaining it could not find a contractor to replace Taylor Woodrow. Siemens and the other members in NewMetro, consultants Gibb and Mott MacDonald, signalling outfit Westinghouse andfinancier Innisfree, are looking to join up with other consortia.