Mangaroa railway station war. After the war the depot was a disposal site for surplus stores until RNZAF use ceased in July 1949, at which time it is assumed that the site was transferred to the NZ Army for their use. Prior to the construction of the Rimutaka Tunnel, several proposals for a tunnel under the Rimutaka Ranges to bypass the Incline section involved tunnels with a western portal to the north-east of Mangaroa station. In 1898 a survey was completed for a tunnel between Mangaroa and Cross Creek. The idea received a great deal of attention, but ultimately went nowhere as such
Dularcha Railway Tunnel the southern approach of the tunnel runs parallel to the current North Coast Line rail track. The tunnel runs on a north–south axis. Two semi-elliptical concrete portals are located at the north and south openings of the tunnel. The tunnel is concrete-lined throughout with cuttings at either end. A vehicular dirt track in the National Park in part following the original rail line now removed, passes through the Dularcha Railway Tunnel joining the two towns. The tunnel is approximately long and curves slightly towards the northern portal. The northern and southern portals are both similar in structure and design. They