Editing Trent and Mersey Canal (section)

===Harecastle Tunnel===
[[File:South Portal, Harecastle Tunnel, Trent and Mersey Canal - geograph.org.uk - 556217.jpg|thumb|The south portal of the Harecastle Tunnel]]
Another major feature is the [[Harecastle Tunnel]], near [[Kidsgrove]] in the city of [[Stoke-on-Trent]], north [[Staffordshire]]. There are actually two tunnels; the first was built by Brindley and was {{convert|2880|yd}} long, and boats were moved through by men lying on their backs and pushing against the roof with their feet. This was a physically demanding and slow process and created major delays, so [[civil engineer]] [[Thomas Telford]] was commissioned to provide a second, wider, parallel tunnel with a towpath. This {{convert|2926|yd|m|adj=mid|-long}} tunnel was opened in 1827. 

In the 1900s, the Brindley tunnel was closed because of severe subsidence, but the Telford Tunnel – although also prone to the same problems – remains in use, and is the fourth-longest navigable canal tunnel in the [[United Kingdom]].