Uploaded December 2025 | Updated September 2026, 3 weeks ago

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Mountains are one the greatest challenges a railway can face. Tough climbs, perilous ascents and extreme weather conditions, have all posed seemingly impossible problems. In this episode we’ll investigate the daring railway engineering that has conquered our greatest ranges, to create some of the most innovative railways on the planet.

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Impossible Railways is a unique science and history series that showcases some of the world’s most extraordinary railways, and the daring engineering, that made them possible.
Since their meteoric rise in the 19th Century, railways have been at the forefront of modern engineering and transport. They have conquered the World’s mightiest mountains, crossed the wildest waters, penetrated great wildernesses, and mastered the urban streets.

This film was first broadcast: 2017

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