the mirboo area was settled by timber getters in the late 1870s, attracted particularly by the mountain ash. the original railway branch line from morwell to mirboo north was completed on 7 january 1886, with the last train being run on 22 june 1974. the railway was constructed through difficult hilly terrain requiring construction of massive embankments and numerous bridges. the convoluted history of the post office below demonstrates the attempts to form a viable mirboo township, culminating in the township of mirboo north at the railway station becoming predominant.