North London line

The North London line is a railway line which passes through the inner suburbs of west, north-west and north London, England between Richmond in the south-west and Stratford in the east, avoiding central London. Its route is a rough semicircle.

Although much of it originated as part of the North London Railway, the current route is the result of a series of amalgamations, closures and reopenings, and has a mix of third-rail and overhead electrical power supply. It remains heavily used by freight services in addition to the main London Overground service. Between Richmond and Gunnersbury, London Underground's District line shares tracks with London Overground services; the entire route is owned and maintained by Network Rail.