Westcombe Park station is in Greenwich, London, and is situated on the North Kent line connecting suburbs (e.g.: Deptford, Greenwich, Charlton, Woolwich, to Dartford, Kent) along the south side of the River Thames with central London stations (London Bridge, Cannon Street and Charing Cross).
The station was opened by the South Eastern Railway in 1879, the year after the through line from Greenwich to Maze Hill was finally completed.
It is in Travelcard Zone 3.
The Wikipedia page is [1] and the TfL page is [2]. Royal Borough of Greenwich page here