It was improved with ballasting and work on the line to accommodate heavier rolling stock on excursion trains.

Due to the steep grades down to Mundaring Weir, a limited range of locomotives were permitted to be run on the line.

In the 1940s the declining availability of Msa Garratt steam locomotives affected the number excursion trains that could run to the weir.

This was a particular problem during times when the weir overflowed, because the Msa Garratt seemed to be the only engine in service capable of negotiating the steep gradients.

[9] Services on the connecting line, Mundaring branch railway, ceased traffic on 23 January 1954.