"About 50 or 60 years ago a Tunnel was constructed for canal purposes which proved a failure and was abandoned, its direction was such as to cross very obliquely the line of the New Railway Tunnel and its level was about a foot below the level of the new tunnel. I enquired what precautions had been taken at the crossing, and was informed that the old Tunnel had been completely taken out...and in addition a length of 20 feet of the old tunnel on each side of the new one had been built up solid with rubble masonry...