to the line speed of 40 mph, the upper limit for the tunnel; accordingly, container trains could be more easily run to and from the Port of Southampton. Network Rail projected that the scheme would see 50,000 fewer lorries on the national road network due to the increased viability of freight services as a result of the wider scheme, which was reportedly costed at £71 million. 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. References External links Southampton Canal Society Southampton and Salisbury Canal Pages Southampton Tunnel works finished a year early via networkrailmediacentre.co.uk Rail transport in Hampshire History of Hampshire Railway tunnels in England Tunnels completed in 1847 Tunnels in Hampshire 1847 establishments in England