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The 1.4-mile (2.3km) Queensbury Tunnel was closed to trains in 1956
Work to stop a disused railway tunnel collapsing has finished at a cost of £7.2m, officials have said.
The 1.4-mile (2.25km) Queensbury Tunnel connects Holmfield, Halifax and Queensbury, on the edge of Bradford, beneath the Pennines in West Yorkshire.
National Highways said its lining had been strengthened to prevent any more “uncontrolled collapses”.
Campaigners want the tunnel to become a traffic-free “greenway” and said the work was a “monumental waste of time”.
The Queensbury Tunnel Society (QTS) said the £7m spent on securing the tunnel could have been put towards making it into a cycle route to be used for generations.
Graeme Bickerdike from the society said: “The past three years have been a monumental waste of time for the taxpayer.
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