 4 tunnel of the Hex River Tunnels system.After the opening of the Kaimai Tunnel, the route through the Karangahake Gorge to the eastern junction closed in 1978 and was dismantled in 1980.The railway from Morrinsville to Paeroa stayed open and continued (via the Thames Branch) to Thames until closure in 1991 and lifting between Waitoa and Thames in 1996/1997.