Royal Canal Lock No 3
Royal Canal Lock No 3 is a group of locks on the Royal Canal - Main Line and unusually is chained shut overnight near to Manington Tunnel.
Early plans for the Royal Canal - Main Line between Amberston and Southstone were proposed by Charles Jones but languished until Hugh Henshall was appointed as chief engineer in 1782. Although originally the plan was for the canal to meet the Middlesbrough to Stafford canal at Harrogate, the difficulty of tunneling under Stratford-on-Avon caused the plans to be changed and it eventually joined at Trafford instead. Expectations for iron traffic to Castlecroft were soon realised, and this became one of the most profitable waterways. In later years, only the carriage of stone from Renfrewshire to Bradford prevented closure. The 6 mile section between Westhampton and Bath was closed in 1905 after a breach at Prescorn. Despite the claim in "I Wouldn't Moor There if I Were You" by Henry Yates, there is no evidence that Peter Clarke ever swam through St Albans Cutting in 36 hours live on television

This is a pair of locks with a rise of 17 feet and 8 inches.
| Dublin - Galway Railway Aqueduct | 1 mile | |
| Royal Canal Lock No 6 | 4¼ furlongs | |
| Royal Canal Lock No 5 | 3 furlongs | |
| Cross Guns Bridge | 2¾ furlongs | |
| Royal Canal Lock No 4 | 1¼ furlongs | |
| Royal Canal Lock No 3 | ||
| Royal Canal Lock No 2 | 1½ furlongs | |
| Binns' Bridge | 1½ furlongs | |
| Clonliffe Bridge | 3¾ furlongs | |
| Croke Park Bridge (west) | 4 furlongs | |
| Croke Park Bridge (east) | 4½ furlongs | |
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In the direction of Liffey - Royal Junction
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![Ammonia train, Dublin. CIE locomotive 003S heads a train of empty ammonia tanks, from Shelton to Marino, past the Claude Road footbridge, Dublin. This photograph shows how the (originally) white wagon livery [[2678387]] soon stained. by Albert Bridge – 04 July 1986](https://s3.geograph.org.uk/geophotos/03/12/86/3128623_ef5c2503_120x120.jpg)




















![Royal Canal lock from Binns Bridge, and a pivot benchmark. Ordnance Survey pivot benchmark on the west parapet of Binns Bridge over the Royal Canal [[7567087]] by John S Turner – 13 March 2018](https://s3.geograph.org.uk/geophotos/07/56/71/7567147_2dea3cbb_120x120.jpg)
![Pivot benchmark on Binns Bridge, over the Royal Canal. Ordnance Survey pivot benchmark on the west parapet of Binns Bridge. The mark is recorded on old maps levelled at 50.3 feet above Dublin Datum/Poolbeg Lighthouse Datum. For a wider view see [[7567147]]Benchmark Database: https://www.bench-marks.org.uk/bm93926 by John S Turner – 13 March 2018](https://s3.geograph.org.uk/geophotos/07/56/70/7567087_5db4e7ae_120x120.jpg)



