TfL has announced that testing the new signalling system to upgrade the Sub Surface Lines has been successful.
From TfL Press release
Transport for London (TfL) this weekend expanded testing of the new, modern Tube signalling system, which is set to transform the Circle, District, Hammersmith & City and Metropolitan lines, to its largest area yet. The new system was successfully tested from Hammersmith through to Euston Square and Paddington, with the work involving the complex Baker Street junction - the first such junction to be tested with the state-of-the-art Thales communications-based train control (CBTC) system.


