The District line is long and serves 60 stations. The line is electrified with a four-rail DC system: from Upminster to Putney Bridge, Olympia, Barons Court, and Edgware Road a central conductor rail is now energised at and a rail outside the running rail at , giving a potential difference of . The section from Barons Court to Ealing Broadway remains at with a rail outside the running rail at , giving a potential difference of . The two sections over which main line trains run, from East Putney to Wimbledon, and from Gunnersbury to Richmond, have the centre rail bonded to the running rails. West of Earl's Court, there are four branches. At Ealing Broadway station, the District line has platforms north of the Central line and the Great Western main line out of Paddington. After about , the line meets the Piccadilly line Uxbridge branch at Hanger Lane junction, and the tracks are then shared through Ealing Common station until Acton Town station, where the Piccadilly line Heathrow branch joins. From Acton Town to Barons Court, the line has four tracks, paired by use: the District line uses the outer pair and the non-stopping Piccadilly line trains use the inner pair. At Richmond station, the London Overground and District line platforms are north of the Waterloo to Reading line through platforms. The two tracks which cross the Thames at Kew Railway Bridge are shared with the London Overground trains until Gunnersbury junction, after which the District line tracks join the four-track District and Piccadilly lines just before Turnham Green station.