SIR – Your article regarding the restoration of a former Great Northern Railway tunnel and its incorporation into the Great Northern Trail (T&A, January 18) refers throughout to the one-mile 751-yard Queensbury tunnel, which carried the line from Queensbury to Halifax.

But the map and photographs clearly show the 662-yard Well Heads tunnel, which carried the line from Queensbury to Keighley but is in Thornton, not Queensbury.

Queensbury tunnel itself is flooded for half its length, with the portal at the Halifax end almost completely submerged, thanks to rubbish having been dumped into the very deep Strines cutting, creating a dam containing millions of gallons of water.

Noel A Shaw, Bronte Old Road, Thornton

Mr Shaw is correct, the article featured a map which showed the incorrect tunnel. Although the article referred to a project to reopen the Queensbury Tunnel, a graphic with the article showed the Well Heads tunnel near Thornton. However, we are assured the picture does show Queensbury Tunnel, which is apparently flooded from the south portal to a point about 1,000 yards in, but the remaining 1,500 yards is wet but drained.