The fifth series of the documentary series opens down under as we travel on one of the oldest steam railways in Australia on a coast-to-coast journey, and climb through the Blue Mountains aboard the iconic Indian Pacific..
Our journey begins in Anchorage, Alaska, where we board a luxury passenger train. We then head north to enter the vast wilderness of Alaska, America's largest and remotest state.
A close look is taken at the Far North Line, which travels from Inverness in the Highlands of Scotland to Wick in Caithness county, with a daily ScotRail service.
