The 5th of 5 Boronia tunnels on Cowan Bank, NSW. It is 243ft long on a 10-chain curve and a gradient of 1 in 40 facing up trains.
The tunnel was bypassed by a short deviation in 1909. It is modelled as it appeared in the 1950s, with the tracks removed.
The height difference between the north and south portals is 6ft (1.85m).