Disused since 1986, the 170-arch viaduct defied engineers' fears about its condition, says Mr Noble.

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The route runs over the 33-arch Hockley Viaduct alongside the M3 at Winchester.

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Work to extend the line began last year and if fundraising goes to plan it should be completed in 2010, with steam trains entering East Grinstead over the 10-arch Imberhorne viaduct.

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