service calling at , , , , and . It then carries on, stopping at , , , , , , and , before picking up the High Speed Line to , and arriving back at . A service operates in the opposite direction. There is one other High Speed Service that runs on a small part of the line, starting from and calling at and before heading to , and , then picking up the High Speed Line and calling at the remaining stations to . A Thameslink service now starts from Rainham and calls at nearly all stations via , , , (for future Elizabeth line / Crossrail services), and (both for the Docklands Light Railway), , and beyond. Passengers for , or now have to change at . Rolling stock The following trains are operated on the line : Class 465 "Networker" since 1992, Class 466 "Networker" since 1993, Class 375 "Electrostar" since 2001, Class 395 "Javelin" since 2009, and 8-car Class 700 "Desiro City" since 2018. History The line was built by the London, Chatham and Dover Railway, who were in competition with the South Eastern Railway (hence the duplication of stations in Kent). They subsequently built lines to Sevenoaks and Ashford (via Maidstone) from the Chatham Main Line. The line was electrified (750 V DC third rail) in a series of stages. Initially the new Southern Railway electrified the urban (within London) workings of the SECR in the 1920s. In July 1925 "South Eastern Electrification (Stage 1)" saw the line from Victoria to junction with the South Eastern Main Line at Bickley, including the Catford Loop Line electrified. This was extended to outer suburban workings to Sevenoaks via Swanley (Bickley junction to Swanley) in two stages, reaching St Mary Cray in May 1934 and Swanley in January 1935. Full outer suburban electrification was achieved with the "Maidstone & Gillingham Electrification" scheme in July 1939, extending electrification from Swanley to Gillingham. Post war, under the BR's 1955 Modernisation plan, electrification was completed (Gillingham to Ramsgate and Dover) under "Kent Coast Electrification" stage 1 in 1959. At the same time the four track section between Shortlands and St Mary Cray junction was extended to Swanley Junction with a complete rebuilding of the St Mary Cray Junction. Two passing loops were added (to create a four-track section) between Rainham and Newington. A short branch was built during World