The Guangzhou-Lhasa Train

China’s vaunted high-speed train covers almost 4500 km from Shanghai to Lhasa in just 48 hours, one of the fastest long-distance train journeys in the world, hauling 863 passengers across the roof of the world.

But there is another train to the Tibetan capital, a 4980 km journey from Guangzhou that passes through 10 cities and terrain that stretches from…