The former Redbank Range Railway Tunnel is historically significant as the first railway tunnel used by the NSW Railways. It is also historically significant as one of the structures and works which provide evidence of the Great Southern Railway. In addition, it has further associations with the history of WWII as one of a number of disused railway tunnels which were used for defence storage purposes and then subsequently given over to the peacetime use of commercial mushroom growing. It also has technical significance as a fine example of the stonemasonry and tunnel design of its time.
Access to the tunnel is available weekdays only from 9:00am-2:30pm (closed public holidays). The Tunnel can only be viewed from the outside due to deterioration of the internal structure which is not deemed safe.