The Western railway line is a narrow gauge railway, connecting the south-east and south-west regions of Queensland, Australia. It commences at Toowoomba, at the end of the Main Line railway from Brisbane, and extends west 810 km to Cunnamulla, passing through the major towns of Dalby, Roma and Charleville, although services on the 184 km section from Westgate to Cunnamulla have been suspended since 2011. The Queensland Government was the first railway operator in the world to adopt narrow gauge for a main line, and this remains the system-wide gauge.

The Main Line is a railway line in South East Queensland, Australia. It was opened in a series of sections between 1865 and 1867. It commences at Roma St Station in Brisbane and extends west 161 km to Toowoomba. It is the first narrow gauge main line constructed in the world. The section of the line from the end of Murphys Creek railway station to the Ruthven Street overbridge, Harlaxton is listed on the Queensland Heritage Register. The Murphys Creek Railway Complex, the Lockyer Creek Railway Bridge (Lockyer), the Lockyer Creek Railway Bridge and Swansons Rail Bridge are also heritage listed.