On the main line, there are cross-platform interchanges at Acton Town, Hammersmith and Barons Court stations, after which the Piccadilly line tracks descend into tunnels, while the District line becomes two tracks through West Kensington station. Before the line enters Earl's Court station, the short Kensington (Olympia) branch joins at a flat junction and the Wimbledon branch at a grade-separated junction. On the Wimbledon branch, the District line at Wimbledon station is west of the South Western Main Line platforms, then the two-track line has a junction at East Putney station with the Hounslow Loop Line, before passing over the River Thames on Fulham Railway Bridge; the line continues by passing under the West London Railway and coming alongside it at West Brompton station before the junction with the main line and the four-platform Earl's Court station.