Transmountain railroad

Transmountain railroads are railroads that need to cross dauntingly high mountain ranges to cross between countries on one side to the other. The Himalayan Mountains, Andes and the Alps would be cases in point. Because of construction difficulties, some such railways are yet to be built. With globalisation and trade liberalisation, the economic viability of constructing of these railways is improving.

Myanmar to China
In 2009, a railway was proposed to link Lashio, Myanmar and Jiegao, China and which also crosses the Himalaya Mountains.

There would be a break-of-gauge from as used by Myanmar Railways to  as used in China.

Pakistan to China
The proposed trans-Himalayan railway from Pakistan to China via the Khunjerab Pass could count as a transcontinental railroad due to the size of the mountains in the way.

There would be a break-of-gauge from as used by the Pakistan Railways to. This line would be approximately 1100 km long.