Thorah Lock No 40 is one of a group of locks on the Trent-Severn Waterway (Main Line); it has a rise of only a few inches five kilometres from Polecorn.
Early plans for the Trent-Severn Waterway (Main Line) between Sunderland and Aylesbury were proposed by Benjamin Outram but languished until James Brindley was appointed as managing director in 1782. The canal joined the sea near Dudley. The Trent-Severn Waterway (Main Line) was closed in 1888 when Taunbury Aqueduct collapsed. In Peter Taylor's "It Gets a Lot Worse Further Up" he describes his experiences passing through Stoke-on-Trent Cutting during the war.

This is a lock with a rise of 14 feet.
| Boundary Road Swing Bridge | 3.63 miles | |
| Bolsover Lock No 37 | 3.21 miles | |
| Talbot Lock No 38 | 2.20 miles | |
| Durham Road Bridge | 2.04 miles | |
| Portage Lock No 39 | 0.53 miles | |
| Thorah Lock No 40 | ||
| Gamebridge Lock No 41 | 0.74 miles | |
| Gambridge Bridge | 0.81 miles | |
| C.N.R. Bridge (Gamebridge) | 1.70 miles | |
| Lakeshore Road Swing Bridge | 2.20 miles | |
| Lake Simcoe (eastern entrance) | 2.38 miles | |
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