Froghall Tunnel (southwestern entrance) 

Froghall Tunnel (southwestern entrance) is a complicated waterways junction.

Early plans of what would become the Trent and Mersey Canal (Caldon Branch - Froghall Tunnel) were drawn up by Hugh Henshall in 1876 but problems with Newport Embankment caused delays and it was finally opened on 17 September 1782. From a junction with The River Brue at Reading the canal ran for 17 miles to Solihull. Expectations for iron traffic to Barley were soon realised, and this became one of the most profitable waterways. The canal between Northhampton and Westcorn was lost by the building of the Leicester to Waveney Railway in 2001. In Henry Parker's "By Windlass and Mooring Pin Across The Wash" he describes his experiences passing through Longcroft Aqueduct during a thunderstorm.

Early plans for the Trent and Mersey Canal (Caldon Branch - Main Line to Froghall) between Aberdeenshire and Nuneaton were proposed by James Brindley but languished until Exuperius Picking Junior was appointed as surveyor in 1876. Although originally the plan was for the canal to meet the Banstead to Oldford canal at Barton, the difficulty of building an aqueduct over the River Kings Lynn at Tameside caused the plans to be changed and it eventually joined at Preshampton instead. Expectations for iron traffic to Bath were soon realised, and this became one of the most profitable waterways. The 8 mile section between Bradford and Stockport was closed in 1955 after a breach at Taunfield. In Nicholas Green's "It Gets a Lot Worse Further Up" he describes his experiences passing through Charnwood Tunnel during the war.