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Greenford station is a London Underground and National Rail station and is owned and managed by LUL. It is the terminus of the National Rail Greenford Branch Line, and is in Travelcard Zone 4. The present station opened in 1947.
The station is on the Acton - Northolt Line and the Central Line.
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The London Underground system is also known as the "Tube". It is the oldest underground system in the world, the first section dating from 1863. The present system has over 250 miles of track and 272 stations. There are 11 lines covering Greater London, Essex, Buckinghamshire & Hertfordshire. Nearly half the system is above ground.
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The Greenford Branch Line is a 4.4 km suburban railway line in west London. It runs north from a triangular junction with the Great Western Main Line west of West Ealing to a central bay platform at Greenford station which is also on the London Underground Central line. A triangular junction near Greenford connects to the New North Main Line. It is one of the few remaining true branch lines in the Greater London area. The line opened in 1903.
Wikipedia: Link