Editing Jubilee line (section)

=== 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.<ref>{{Cite press release |url=http://www.tfl.gov.uk/static/corporate/media/newscentre/archive/3816.html |title=Travel advice for the festive season |date=19 December 2005 |access-date=9 March 2010 |publisher=Transport for London}}</ref> 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.

An extra four complete seven-car trains were added to the fleet, bringing the total to 63. This enabled the period during which a full service could be run to be increased. The full fleet was not required to be available until full advantage could be taken of the new signalling system.

The result of the seventh-car upgrade was a 17% increase in capacity, allowing 6,000 more passengers per hour to use the line. Work was completed and the line reopened two days ahead of schedule, on 28 December 2005.