 A third of all tracks are due to be replaced by 2010 |
The entire Waterloo and City Line and sections of the Northern Line may shut for months at a time for maintenance work, London Underground has said. Managing director Tim O'Toole told London Assembly's transport committee it was a move he was prepared to take to get the "payback".
Metronet and Tube Lines took over maintenance under the Public Private Partnership (PPP) scheme in 2003.
The contract requires a third of all tracks to be replaced by 2010.
So far, only 4% of them have been done.
The firms have 30-year contracts worth �15bn and combined profits of almost �100m.
A Transport for London (TfL) spokesman said no decision has been yet and passengers would be made aware of any closures.