eastender wrote:
A £5.54bn investment in four London Underground (LU) lines should improve
efficiency, Transport for London (TfL) has claimed.

Work to the District, Circle, Metropolitan and Hammersmith & City lines
will include a new signalling system, new track, longer platforms and rebuilt train depots.

Tfl said the plans for a new signalling system include the oldest part of
the network built, which was built in 1863 and "belong in a museum".

http://www.bbc.co.uk/news/uk-england-london-32034660

This, of course, is the long-delayed SSL resignalling contract that has had
at least two false starts so far. The new track, S Stock trains, depot
extensions and platform extensions have already happened, in some cases,
several years ago.