4.3 Technical assumptions for route infrastructure assessment

The Isle of Wight railway network was built to a restrictive structure gauge and subsequent works do not comply necessarily with the current standards. The specification includes a 55 mph line speed. In considering the reopening of routes on the Island it has been assumed that new works will have to comply with current Railtrack and HSE standards although derogations would be sought for existing structures. The Technical Report details the level of specification assumed as an input to costing for permanent way, structures, stations, level crossings, and signalling.