Purley Oaks railway station is in the London Borough of Croydon in south London, on the Brighton Main Line between Croydon and Redhill. All trains serving it are operated by Southern and it is in London Travelcard Zone 6. The station comprises four platform faces, that on the west side unused (up fast line), an island platform whose western face is unused (down fast) and whose eastern face is used by up trains, and a platform on the eastern side served by down trains.