 As part of the construction works for the atmospheric-propulsion system, the world's first railway flyover was constructed at the north end of Portland Road, to carry the new atmospheric line over the conventional steam line below.In 1847, the atmospheric propulsion experiment was abandoned.Following construction of new lines, the station closed on 1 June 1859 and was replaced by a new station on the south side of the road, Norwood Junction, which is still in use, now part of the newly-extended East London Line of the London Overground which was opened on 23 May 2010.