Beckton tube station

From the longer Wikipedia page

Beckton was an authorised railway station planned by London Underground but never built. It was to be located in Beckton in the London Borough of Newham, in east London as a station on an unbuilt extension of the Jubilee line. It would have been the terminus of a branch from Custom House adjacent to a planned depot for the line.

See also Beckton Railway Station and Beckton Station.