Southampton Tunnel

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Southampton railway tunnel. Engineering works December 2009 - January 2010

Railways in the Southampton area

Legend West Coastway Line to Brighton and Portsmouth to Gosport x20px South Western Main Line to London Waterloo Fareham M27 Swanwick Meon Valley Railway to Alton Knowle Halt Wessex Main Line to Bristol via Salisbury River Hamble Bishops Waltham Botley Durley Halt A27 to Andover (1858–1964) Hedge End Eastleigh x20px Bursledon Romsey Hamble Chandlers Ford File:BSicon lBSTl.svg File:BSicon lBSTr.svg Eastleigh Works Hamble Fuel Terminal Southampton Airport Parkway Netley M27 Sholing A27 Woolston Swaythling Bitterne Portswood (1861–66) River Itchen M27 St Denys Northam TMD Southampton Tunnel Southampton Terminus Eastern Docks Southampton Central Bus link to Town Quay Millbrook Central Docks Nursling Western Docks Redbridge Fawley Refinery River Test Fawley A35 Hythe Totton Marchwood Port Marchwood Ashurst (New Forest) Beaulieu Road Lymington Pier Ferry to Yarmouth IoW Brockenhurst Lymington Town Ampress Works Halt S&D Railway to Dorchester via Ringwood South Western Main Line to Bournemouth

Southampton Civic Centre Tunnel is a railway tunnel beneath the Civic Centre in the centre of the Hampshire city of Southampton, in England. Opening in August 1847, its construction linked the stations of Southampton Terminus and Southampton West End (later moved and now known as Southampton Central). The construction of the Southampton and Dorchester Railway linked London through Southampton to towns further west, such as Poole and Dorchester. The through link also accelerated the expansion of Bournemouth.

Construction and operating problems

Geological problems plagued the construction and delayed its opening. The fundamental issue was that the ground was already compromised by the partial construction of the Salisbury and Southampton Canal tunnel, which the railway tunnel crosses at an acute angle and slightly higher. Because the canal tunnel was lined with clay "puddle" it collects water which ends up in the rail tunnel making the latter very wet. In the 1960s an access was cut into the canal tunnel in order to examine it, although this was later sealed behind a new segmental wall structure when, between 1983 and 1985, the tunnel underwent extensive engineering works [1] and the line through it was worked as a single line for long periods while remedial work was carried out. A narrow gauge railway was set up as part of these works.

Services using the tunnel

The tunnel is mostly used by trains on the South Western Main Line from London Waterloo to Bournemouth and Weymouth, on the Wessex Main Line from Portsmouth to Bristol, and for journeys on the local line from Portsmouth to Southampton. Additional journeys are made on the West Coastway Line from Southampton to London Victoria via Gatwick Airport, and on the Cross Country services from Bournemouth to various points in the north of England.

There is also extensive use for freight, most of which is containers to and from Southampton Container Terminal just to the west of Southampton Central.

Tunnel development

During the period Sunday 27 December 2009 to Sunday 3 January 2010 the tunnel closed for the track to be lowered to achieve W10 (freight container) route clearance. Previously, Hi Cube Intermodal container traffic had to be carried on special low wagons with areas which could not be loaded, resulting in both traffic planning issues and lower train capacity. Additionally, all container trains were restricted to 20 mph when passing through the tunnel because of the limited clearances at the top edges of the loaded containers. Since rebuilding no speed or loading restrictions apply to the tunnel and container trains can travel at up to the line speed of 40 mph, the limit for the tunnel. The work meant containers could be transported by rail from the Port of Southampton across the country in a quicker, cheaper, greener and more practical way.

Film

Footage at the start of the film Oh, Mr Porter! features the tunnel at Southampton, filmed from the rear of the train and reversed for showing.