Llangollen Canal an Act of Abandonment in 1944, allowing it to close of canals, including much of the Shropshire Union system. However, the line from Hurleston to Llangollen and onwards to Llantisilio was saved, as it was the main supply of water to the rest of the system. On 6 September 1945, due to inadequate maintenance, the canal breached its banks east of Llangollen near Sun Bank Halt. The flow of hundreds of tons of water washed away the embankment of the railway further down the hill, creating a crater which was long and deep. This caused the first traffic of the
Llangollen Canal to Llangollen thrived until the end of the First World War, after which it saw very little traffic. Navigation was formally abandoned under the terms of an Act of Abandonment obtained by the owners, the London Midland and Scottish Railway, in 1944, but the channel was retained as it still supplied water to the main line of the Shropshire Union, and subsequently to the Mid & South East Cheshire Water Board. This arrangement was due to end in 1954, but as there was no alternative supply of water, the powers were extended. Early pioneering cruises of the waterway were made