The Fish is the legacy name for the passenger train that operates over the Blue Mountains between Lithgow and Sydney, Australia.

has not formally been used to refer to the Blue Mountains Line service run by NSW TrainLink.

In the 19th century, a train from Sydney to Penrith was driven by John Herron, a large man with the nickname of The Big Fish.

Following electrification of the Main Western line in 1958, it was operated by U set single-deck electric trains.

[2] According to the current timetable,[3] The Fish leaves Lithgow at 5:08 am, reaches Mt Victoria at 5:37 am and arrives Sydney at 7:47 am.