Quarry Tunnel is 2,113 yards (1,932 metres, or about 1.2 miles or 1 mile 1.6 chains) in length. It was constructed between 1896 and 1899, being formally opened on 8 November 1899. The contractors were Messrs Firbank, and the estimated cost was £85,000. pp. 117-122. The new tunnel was approached by a 100 ft deep cutting on the north side. Both Quarry Tunnel and the original Merstham Tunnel have been operated through to the twenty-first century; while the former is predominantly used by fast trains, services that stop at Redhill and Merstham have instead continued to use the older Merstham Tunnel.
