Dukart's Canal
United Kingdom
Dukart's Canal was built to provide transport for coal from the Drumglass Collieries to the Coalisland Canal in County Tyrone, Ulster, Ireland. It opened in 1777, and used three inclined planes, rather than locks, to cope with changes in level. There is little evidence that it was ever used, as the planes could not be made to work properly, and they were dismantled in 1787.
Canal data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).