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
Llangollen Canal by Tom Rolt in 1947 and 1949, and despite being officially closed, a number of boats started to use it. There was a growing campaign to reopen it, but it was still designated as one of the 'waterways having insufficient commercial prospects to justify their retention for navigation' under government papers published in 1955 and 1958. It was not until the passing of the Transport Act 1968 that the route was finally designated as a cruiseway, and its future was secured. As leisure use of the canals grew, the route was rebranded as "The Llangollen Canal" in the 1980s, and