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
Ellesmere Canal three-lock arrangement. At this point, the section is now part of the Shropshire Union Canal. This section was added to link the canal to the national network. It became the Ellesmere Branch of the Shropshire Union Canal and is now part of the Llangollen Canal. This was the principal part of the original main line of the canal. It became the Llangollen Branch of the Shropshire Union Canal and is now part of the Llangollen Canal. This section of the canal was added as a navigable feeder. It is now part of the Llangollen Canal. This section (the Llanymynech Branch)