A branch railway line from Southall railway station to the Brentford Dock on the Thames was also built by Isambard Kingdom Brunel in 1856. It features one of his (impressive for the period) engineering works, the Three Bridges (although it is still often referred to on maps by the original canal crossing name of Windmill Bridge). where Windmill Lane, the railway and the Grand Union Canal all intersect – the canal being carried over the railway line cutting below in a cast-iron trough and a new cast-iron road-bridge going over both. Brunel died shortly after its completion. Sections of his bell-section rail can still be seen on the southern side being used as both fencing posts and a rope rail directly under the road bridge itself. It is listed as a Scheduled Ancient Monument. The other notable local construction by Brunel is the Wharncliffe Viaduct which carries the Great Western Railway across the River Brent towards London and which was Brunel's first major structural design.