The Blue Mountains line is a section of the Main Western line which opened in 1868.
 The line was built with gradients as steep as 1 in 33 (3%) and curves as sharp as 8 chains (160m).
 Most of the curves were eased to 12 chains (240m) with duplication.

The line originally ascended the eastern and descended the western sides of the Blue Mountains via a series of zig-zag track sections.
The eastern zig zag was by passed by a tunnel in 1892 and the western zig zag (once a tourist railway) was bypassed in 1910 with the Ten Tunnels Deviation.
The Blue Mountains line is a section of the Main Western line which opened in 1868.  The line was built with gradients as steep as 1 in 33 (3%) and curves as sharp as 8 chains (160m).  Most of the curves were eased to 12 chains (240m) with duplication.
The line originally ascended the eastern and descended the western sides of the Blue Mountains via a series of zig-zag track sections. The eastern zig zag was by passed by a tunnel in 1892 and the western zig zag (once a tourist railway) was bypassed in 1910 with the Ten Tunnels Deviation.
Blue Mountains Line