London Underground Modernization: the Next Four Lines

An update on London Undergrounds latest phase of modernization. Introducing a new signalling system to the District, Circle, Metropolitan and Hammersmith and City lines.

These highly interconnected lines make up 40 percent of the Tube network by route length. For the first time ever they are being modernized as a single integrated system, introducing the same type of air-conditioned, walk-through train and modernized signalling on all four lines. Overall they're increasing capacity by 33 percent.