London Overground

Not to be confused with London Underground, Overground Network, or Transport in London § Heavy rail.

For the music genre, see Overground.

London Overground
A pair of London Overground Class 710s at London Liverpool Street next to a Greater Anglia Class 745
Overview
Owner	Transport for London
Locale	Greater London and Hertfordshire
Transit type	Commuter rail
Number of lines	6
Number of stations	113 served (81 operated)
Annual ridership	189 million
Website	tfl.gov.uk/modes/london-overground/
Operation
Began operation	11 November 2007 (2007-11-11)
Operator	First Rail London (2026–2034)
Reporting marks	LO (National Rail)
Technical
System length	167 km (103.8 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	Overhead line, 25 kV 50 Hz AC Third rail, 750 V DC
System map

The London Overground (also known simply as the Overground) is a suburban rail network serving London and some of its northern environs. Established in 2007 to take over Silverlink Metro routes, it now serves a large part of Greater London as well as Hertfordshire, with 113 stations on the six lines that make up the network.

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 First Rail London since May 2026. TfL previously assigned orange as a mode-specific colour for the Overground in branding and publicity including the roundel, on the Tube map, trains and stations. In 2024, each of the six Overground lines were given a distinct colour and name.