The government railway from Clifton to North Kiama opened in 1887 and included a single-platform Unanderra Station complete with weatherboard platform building and stationmaster's residence.

Fuller, whose family owned much of the Shellharbour district (indeed, Dunmore was named for his father's birthplace), took a keen interest in the development of the railways in his native Illawarra region.

Despite costs doubling to £3 million, the line opened in August 1932, channelling freight traffic from the Southern Tablelands and Riverina regions through Unanderra and on to Port Kembla.

[7] Between 1983 and 1988, electrical masts were installed along a section of the Moss Vale line near Unanderra in preparation for the subsequently cancelled Maldon–Dombarton rail link.

The project stalled the following year after it was discovered that the plans had been approved without a proper utilities search at the site: water, gas and signal cables would need to be relocated to accommodate the lift shafts, at an additional cost of $5 million.