Plot: Clutching his 1899 Appleton’s Guide, Michael Portillo boards one of the world’s most famous trains, the Rocky Mountaineer, to cross the backbone of the North American continent from Kamloops to the spa resort of Banff. This magnificent journey takes him to the highest point of the 19th-century transcontinental Canadian Pacific Railway line at Kicking Horse Pass, past Lake Louise and inside spiral tunnels blasted through the mountains