As I said on the other thread about Homerton, Surrey Quays is not a London Underground station either:
In recent years there has been a very unhelpful and false amalgamation between London Underground stations and others on either Network Rail or (more usually) the London Overground system. Many maps now show them all. It may hep passengers get about but it doesn't help people trying to do quizzes and crossword puzzles. There are just 270 stations on the London Underground system. There has never been more than 280. This was the figure from 17th July 1975, when Hatton Cross opened on the Piccadilly Line, to 4th October that same year when Essex Road and Drayton Park ceased to be served by the Northern City line. Puzzlers should confine themselves to those stations only.