The original building consisted of 3 rooms with a small toilet annex, with a flat roof, to the south-west corner. At some stage (between 1916 and 1931 according to documentary evidence) the building was extended with a flat roof structure to the west. This space is currently used as the booking office. Also added to the south was a lean-to workshop, which is a timber-framed structure clad in weatherboards. The date of this extension is not known but this section of the building has detailing which is contemporary to construction dating from 1930 to 1950. The windows have security bars fitted to all the windows and doors along the southern elevation.