Thornleigh railway station is a station on Sydney's CityRail network servicing the suburb of Thornleigh in Sydney's Upper North Shore. Opening in 1886, this station lies on the Northern Line leading from Berowra in the north through to North Sydney station via Strathfield and Central.
This station has three platforms- two in the 'Up' direction (platforms 1 and 2) and one in the 'Down' direction (platform 3); however platform 1 is rarely used, as passenger trains rarely use the 'Up and Down Relief lines' which start at Thornleigh. The station is served by four trains per hour each way, with additional trains during weekday peak hours. During off-peak hours two of these four train services towards Central terminate in Chatswood.