Timberley Viaduct

near Amberley, Sussex
Built by the London, Brighton and South Coast Railway in 1861-3 to carry the Horsham to Ford railway line across the River Arun. It has fifteen spans, the main river crossing being by a bowstring girder 106 feet long.
The bridge girders crossing the meadows are supported on cast iron trestles at approx 30 ft intervals, while the wrought iron bowstring girder is supported on cylindrical cast iron columns. Major modifications were carried out in 1894, presumably involving the replacement of cast iron load-bearing girders with riveted wrought iron or steel girders.
For more information and excellent photographs, see here.[1]. See also here[2]
The bridge does not appear to be accessible by public roads or footpaths.