The following years saw a number of plans to extend the line further up the Derwent Valley or to connect it to the West Coast. Finally, twenty one years later, in 1909, it was extended along the Tyenna River, another 8 km to what is now Westerway. In 1917 another extension was added to extend the railway to Fitzgerald (66 km), and a final extension was opened in 1936 to Kallista, 74 km from Bridgewater. The last extension replaced an earlier wooden tramway on the same alignment. The primary usage of the line was to provide a service to the rural areas and the logging areas around Kallista. In 1940 there was a significant increase in log traffic along most of the line with the opening of a paper mill at Boyer, 14 km from Bridgewater. This increased traffic resulted in the construction of two deviations and additional facilities at a number of stations.