[1] After some years of no service, the railway south of Witchcliffe was rehabilitated, including the construction of a realignment north of Jarrahdene.

Although a slow service due to the lighter rails and steep gradients, the branch was important for the dairy industry in the region.

[9] It was one of three branches in the WAGR system that relied on the important Msa garratt steam engine to be able to move the loads over steep and difficult gradients.

The Flinders Bay engine shed, and some parts of the railway yard were not immediately removed and remained intact until the late 1950s.

[11] Heading south west from Boyanup, the line traverses predominantly agricultural land to a few kilometres beyond Capel, where it terminates at the former Iluka Resources RGC site.

[14] Heading west again along the route of what is now the Bussell Highway, the line served Vasse and Quindalup before turning south towards Flinders Bay.

[15] The line passed through forested and agricultural areas, including several municipally heritage-registered mill sites in the M.C.

[12] This section of this line from Wonnerup to Maryvale follows the alignment of Western Australia's first railway - the Ballaarat Tramway.

The sections from Busselton Jetty to the Carbunup River east of Marybrook and Cowaramup to Witchcliffe were completed in August 2020.