This paper describes the CrossRail project for building a new underground railway across London, and outlines the tools and revised methodology for its new evaluation in January 1994. The project plans to construct new twin tunnels between the main line Paddington and Liverpool Street, to enable many railway services to the west and east of London to be linked. A map of the proposed routes is included. The scheme's promoters will be submitting an Order under the Transport and Works Act. Its 1991 and 1994 economic evaluations used cost-benefit analyses, whose main quantifiable components are listed. The paper outlines the methodology, used to provide a thorough and robust evaluation of the scheme, and to derive estimates of its capital and operating costs and benefits. Revised capital cost estimates were produced in April 1993; they re-assessed base and ceiling costs. The net operating cost was estimated as the difference between the costs, associated with the new services, and the costs of the services to be replaced by CrossRail. The London Transportation Studies model of the Department of Transport (DTp) was run for the Year 2001. It was applied to estimated likely benefits for the period 2001-2011.
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