This episode follows the luxury El Chepe train from above and on the ground. The route is a wonder of Mexican engineering that took 100 years to build and winds through the world's largest canyon region, Copper Canyon.

The Ghan, Australia's most luxurious train, crosses an entire continent from Adelaide on the southern coast to the tropical landscape of Darwin in the north. On its two-day journey, it faces intense heat, the risk of collisions with wild animals and the threat of increasingly extreme weather events. An army of engineers must work around the clock to maintain The Ghan and its 3,000 km of track.