Canada's Winnipeg to Churchill train is filmed from above as it winds through snow-covered grasslands, Boreal Forest and the barren lands below the Arctic Circle

This episode follows the Darjeeling Himalayan Railway, a steeply graded narrow-gauge line connecting the plains of New Jalpaiguri in eastern India to the foothills of the Himalayas in Darjeeling. Led by a century-old steam loco, it is filmed from above as it conquers the world's tallest mountain range.