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- Category: B
- Date Added: 13/12/1999
- Local Authority: Highland
- Planning Authority: Highland
- Burgh: Inverness
National Grid Reference
- NGR: NH 64847 46600
- Coordinates: 264847, 846600
SWING BRIDGE: rebuilt 1909 for the Highland Railway. Steel bowed box-girder swing bridge 37.5m long over Caledonian Canal, with protective timber starlings on both banks of canal.
SIGNAL BOX: (Map Ref: NH 64816, 46578): Mackenzie and Holland for Highland Railway, 1890. 2-storey, rectangular-plan, plank and strip weatherboarded signal box set on brick base. Timber forestair to raised doorway in projecting, half-gabled porch. Continuous fenestration with 4-pane glazing to track frontage, returning to gables. Tin roof with projecting eaves and timber bargeboarding. Small mechanical lever frame with four levers labelled 'up', 'down' and 'bridge locks'.
Statement of Special Interest
The swing bridge and signal box at Clachnaharry are excellent examples of their industrial building types with strong contextual association with the Caladonian Canal. They are located on the outskirts of Inverness at the mouth of the Caledonian Canal where it joins the Beauly Firth. The strong functional relationship between the swing bridge, canal, signal box and railway combine to add significantly to the group value at this scenic location.
The first bridge on this site was made of wrought-iron and designed by Joseph Mitchell for the Inverness and Ross-shire Railway in 1862. The 1909 rebuild appears to have been a straight forward replacement of the original structure in steel. It crosses the canal at an angle of 65 degrees and is electrically controlled from the signal box at W end of bridge. There is a level crossing for canal towpath users between the box and the bridge.
Signal boxes are a distinctive and increasingly rare building type that make a significant contribution to Scotland's diverse industrial heritage. Of more than 2000 signal boxes built across Scotland by 1948, around 150 currently survive (2013) with all pre-1948 mechanical boxes still in operation on the public network due to become obsolete by 2021. The signal box at Clachnaharry is a small and little-altered 1890 'Type 3' box by McKenzie and Holland. This important signalling manufacturer provided the signalling for much of the Highland Railway during the late 19th century. Other survivals of this once widespread type are a particularly large example at Aviemore Station and the North box at Boat of Garten Station on the preserved Strathspey Railway line (see separate listings).
List Description updated as part of Scottish Signal Box Review (2012-13)
2nd Edition Ordnance Survey Map (1903). Gordon Biddle and O.S Nock, The Railway Heritage of Britain (1983) p168. The Signalling Study Group, The Signal Box - A Pictorial History and Guide To Designs (1986). Peter Kay and Derek Coe, Signalling Atlas and Signal Box Directory - Great Britain and Ireland (2010 - 3rd Edition).
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