Tickhole Tunnel

The Tickhole Tunnel, also called the Kotara (Tickhole) Railway Tunnel, is a heritage-listed double track railway tunnel located between Cardiff and Kotara stations on the Main Northern railway line in New South Wales, Australia.

The original 176 yd tunnel opened on 15 August 1887. It initially only had one track, but provision was made for the line to be duplicated which duly occurred in 1891. As part of the electrification of the line, in 1983 tenders were called for a second tunnel, of 205 m. This is now used by southbound services while the original once again became single track for northbound services.