London OvergroundLondon Overground (also known simply as the Overground) is a suburban rail network serving London and its environs. Established in 2007 to take over Silverlink Metro routes, it now serves a large part of Greater London as well as the home county of Hertfordshire, with 113 stations on nine different routes. The Overground forms part of the United Kingdom's National Rail network but it is under the concession control and branding of Transport for London (TfL). Operation has been contracted to Arriva Rail London since 2016.
Upminster stationUpminster is an interchange station serving the town of Upminster in the London Borough of Havering, Greater London. It is on the London, Tilbury and Southend line (LTSR), down the line from London Fenchurch Street; it is the eastern terminus of the District line on the London Underground; and it is the eastern terminus of the Romford to Upminster Line on the London Overground network. Upminster is the easternmost station on the London Underground network as well as the easternmost National Rail station in London.
District lineThe District line is a London Underground line running from in the east and Edgware Road in the west to in west London, where it splits into multiple branches. One branch runs to in south-west London and a short branch, with a limited service, only runs for one stop to . The main route continues west from Earl's Court to after which it divides again into two western branches, to Richmond and . Printed in green on the Tube map, the line serves 60 stations (more than any other Underground line) over .
London UndergroundThe London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England. The Underground has its origins in the Metropolitan Railway, opening on 10 January 1863 as the world's first underground passenger railway. It is now part of the Circle, District, Hammersmith & City and Metropolitan lines.