the Bristol General Steam Navigation Company from Broad Quay in St Augustine's Reach.. By 1867, ships were getting larger and the meanders in the river Avon prevented vessels over from reaching the harbour. A scheme to install a much larger lock at Avonmouth to make the entire river a floating harbour, and to straighten the sharper bends, was dropped after work began on the much cheaper docks at Avonmouth and Portishead. The present entrance lock was designed by Thomas Howard and opened in July 1873. This has a width of and is the only entrance lock now in use at the City Docks. From 1893 until 1934 the Clifton Rocks Railway provided a funicular railway link, inside the cliff face, from the western end of the harbour, which is close to the locks, into Clifton. Railways The original Bristol Harbour Railway was a joint venture by the GWR and the Bristol and Exeter Railway, opened in 1872 between Temple Meads and the Floating Harbour. Its route included a tunnel under St Mary Redcliffe church and a steam-powered bascule bridge over the entrance locks at Bathurst Basin. In 1876 the railway was extended by to Wapping Wharf. In 1906, new branches from the south via the Ashton Avenue swing bridge were built to Canons Marsh on the north side of the Floating Harbour and to Wapping via a line alongside the New Cut. A Coal Concentration Depot owned by Western Fuels was established at Wapping Wharf just behind the Industrial Museum but this closed in 1987. Underfall Yard The docks maintenance facility was established on the land exposed by the damming of the river to construct the harbour and remains sited at this location to the present day. William Jessop had created a weir in the dam at Underfall to allow surplus water to flow back into the New Cut, this was known as the 'Overfall'. By the 1830s, the Floating Harbour was suffering from severe silting. Isambard Kingdom Brunel was, however, able to devise a solution to this problem. In place of the Overfall he advised better use of three shallow sluices and one deep scouring sluice between the harbour and the New Cut, together with a dredging vessel. This drag boat would scrape the silt away from the quay walls. When the deep sluice opened at low tide, a powerful undertow sucked the silt into the river to be