Llangollen Canal part of the London Midland and Scottish Railway soon afterwards. After the takeover by the London Midland and Scottish Railway, regular maintenance was often not carried out, and gradually the canals silted up, so that boats could not operate with full loads. Traffic declined, and was significantly affected by a breach that occurred at the Perry Aqueduct, about to the south of Frankton locks, which effectively closed the Montgomeryshire Canal to all traffic. Traffic beyond Frankton to Llangollen had ceased in 1937, and the Frankton to Hurleston section was not used after 1939. The London Midland and Scottish Railway obtained
Horseshoe Falls (Wales) Heritage status because of the bold civil engineering solutions needed to construct a canal with no locks through such difficult terrain. Horseshoe Falls (Wales) Horseshoe Falls (Welsh: "Rhaeadr y Bedol") () is a weir on the River Dee near Llantysilio Hall in Denbighshire, Wales, about north-west of the town of Llangollen. The distinctively shaped weir, which is long, helps create a pool of water that can enter the Llangollen Canal (via an adjacent valve house and flow meter). The canal west of Pontcysyllte Aqueduct and the construction of the weir were authorised by an Act of Parliament obtained in 1804