The Four Lines Modernisation is a series of projects by Transport for London to modernise and upgrade the sub-surface lines of the London Underground, namely the Circle, District, Hammersmith & City a
D78 Stock on its last day in service (right), next to its replacement, an S7 Stock unit (left).
The District line is a London Underground line running from Upminster in the east and Edgware Road in northwestern Central London to Earl's Court in west London, where it splits into multiple branches
A District line train at Wimbledon bound for Edgware Road, 2014
The jointly owned experimental passenger train that ran for six months in 1900
An R Stock train composed of a mixture of unpainted aluminium and (white) painted steel cars
Overhead view of the District line platforms at Earl's Court, 2005