The Ouse Valley Viaduct carries the London to Brighton Main Line over the River Ouse, just north of Haywards Heath in Sussex and is a Grade !! Listed Building. The viaduct is 450 Mtrs long, with 37 arches and is considered to be the most elegant viaduct in Britain. The piers are all vaulted, with the cavities arched at top and bottom, enabling a unique view at ground level, through its entire length.