Canary Wharf station and the Jubilee Line Extension itself were partly funded by the owners of the Canary Wharf complex, with the intention of making it more accessible to commuters. Only five years after the construction of the extension, capacity issues started becoming apparent and upgrades were required. The first step was the lengthening of the trains from 6 to 7 cars. This was done at the end of 2005. The second step was to replace the conventional Jubilee Line signalling with the Thales S40 moving-block system. This was eventually introduced into service during 2011 after many delays and teething problems and allows a more intensive timetable to operate with 30 trains per hour running in the peaks. The building of Crossrail line 1 will bring another rail connection to Canary Wharf and will also relieve pressure on the Jubilee line.