These two arches, each 123ft long are reputed to be the longest brick spans in the world and were built for the Great Western Railway (GWR) in 1839 by Isambard Kingdom Brunel. Annoyingly for Brunel, the bridge collapsed on completion, but this was found to be due to a fault by the constructors rather than in the design. After being rebuilt it has been in continuous use until the present day. On passing under the bridge the curves brick-work can be best appreciated. This view is from downstream looking up to Maidenhead.