20 Dollars The Ghan

The Ghan is an Australian long-distance passenger train running roughly 2,979 kilometers between Adelaide and Darwin, completing its full transcontinental route only in February 2004 — meaning this coin was struck in anticipation of that inaugural full run rather than to commemorate a completed one. The line's northern extension to Darwin had been under construction since 2001, ending a project first proposed in the 1850s that had stalled repeatedly over a century and a half of political reversals and engineering disputes.

Liberia's role here is purely fiduciary convenience — the Central Bank issued dozens of such collector pieces in the early 2000s with no domestic circulation intent.