Tubelines and Metronet agree that one of the biggest challenges they face is having to work in engineering hours without disrupting the daily running of the trains. As a result the consortia will work in partnership with the mayor's transport department Transport for London (TfL) to ensure the travelling public is not faced with too many or badly planned line and station closures.
Tubelines, Metronet and TfL will meet monthly to ensure they are working in tandem.
TfL will allow closures of no more than two sections of line per consortium at any one time.
Normally, the longest allowable night closure on any stretch of line is between 9pm and 6am during the week, or over whole weekends. Other factors will also prevent some closures. 'We couldn't close Notting Hill Gate during the Notting Hall carnival, for example, ' says Metronet's operations director Ben Harding.
But there will also be some longer term closures for large scale works too. Harding says of the Bakerloo, Central, Victoria and sub surface lines:
'You can expect one closure a weekend for the next three years, but after that, possibly two or three - it's the only way you can deliver all the track work.'
TfL, Tubelines and Metronet have also worked out who is responsible for stations where both have lines running through. They will share information so that if a major interchange station is to close, both consortia can use the time to carry out work.
There are also other partnering schemes to share LUL's 'scarce resources'.
Tubelines will own LUL's maintenance trains for example, but they will hire them out to Metronet.