The station has four platforms which correspond with the four railway tracks that were designed to cross the Sydney Harbour Bridge.

[4] From 1932 until 1958, two of the rail tracks designed for the bridge were used by trams, the latter being diverted onto Blue Street just before they would have entered North Sydney Station.

After 1958 the tram tracks were removed from the Sydney Harbour Bridge and replaced by the Cahill Expressway.

Beginning in 1968 when the North Sydney Travelodge was built, the air rights over the station have progressively been redeveloped.

[7] Between April 2006 and December 2008, the station was upgraded to handle extra traffic expected with the opening of the Epping to Chatswood line in 2009.