Fratton railway station was planned and built to serve as an interchange station between Portsmouth and the new one-and-a-quarter mile (2 km) long Southsea Railway branch line, built to serve the fashionable Victorian seaside resort of Southsea. It was built with an additional island platform to the south of the station's three main platforms, which specifically served the Southsea Railway and was reached by a staircase leading from the main overhead footbridge. ("this island platform and staircase was removed after the Southsea Railway was closed, its location is now used as a modern train washing facility")