Seventh car upgrade The Jubilee line closed for three days from 25 December 2005 in order to add an extra car to each six-car train. The line had to be closed as six- and seven-car trains could not run in service at the same time, because the platform-edge doors at Jubilee Line Extension stations could not cater for both train lengths simultaneously. The signalling system was also modified to work with the longer trains.
seventh car upgrade the jubilee line closed for three days from 25 december 2005 in order to add an extra car to each six-car train the line had to be closed as six- and seven-car trains could not run in service at the same time because the platform-edge doors at jubilee line extension stations could not cater for both train lengths simultaneously the signalling system was also modified to work with the longer trains