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Chris sets out to reach the northernmost railway station on Earth in an epic 2000-mile adventure from Moscow into Arctic Siberia.
From the tiny coastal town of Tocopilla, Chris rides one of the steepest railways in the world as he scales the first 1,000 metres of the Andes.
Chris attempts to cross the length of Cuba, the only island in the Caribbean to boast an extensive railway network, from Havana in the west to the far east of the island.