Campaigners hoping to convert a disused railway line into England’s longest cycle and pedestrian tunnel are challenging a government decision to fill much of the historic structure with concrete. The government has agreed to fund plans to infill the tunnel for safety reasons, by the roads agency, National Highways (NH), which is responsible for maintaining the historic railways estate. View image in fullscreen A deluge of water inside the disused Queensbury tunnel. Campaigners accused the government of “investing in destruction” and ignoring the views of 8,000 planning objections to the plan to infill the tunnel. pic.twitter.com/oRSGFSiQOj — Queensbury Tunnel (@QburyTunnel) April 27, 2021NH’s contractors estimate it would cost £26.4m to convert the tunnel.