Since 7 July, the Piccadilly line has been suspended from Hyde Park Corner to Arnos Grove, (right through the middle of central London) and between Rayners Lane and Uxbridge (in the north west of London).
As Tim O'Toole, Managing Director of the London Underground, said: "We are now serving all stations and are determined to get on with the job of transforming the Tube.
"I would like to pay tribute to the work of the staff from London Underground, Metronet and Tube Lines who have done an incredible job in the past few weeks."
I suppose it shows how quickly work can be done when a very public, central and much used part of the network is out of action. It's also a major message to terrorists that we're all determined to get back to normal.