- Owner
- Transport for London
- Locale
- Greater London and Hertfordshire
- Transit type
- Commuter rail
- Number of stations
- 113 served (81 operated)
- Annual ridership
- 189 million
- Website
- tfl .gov .uk /modes /london-overground /
- Began operation
- 11 November 2007 ; 18 years ago ( 2007-11-11 )
- Operator s
- First Rail London (2026–2034)
- Reporting marks
- LO ( National Rail )
- 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