Uploaded July 2026 | Updated September 2026, 3 weeks ago

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In this compilation, we go behind closed doors to uncover the innovative, physics-driven engineering behind the world's most secretive urban rail networks. From driverless subterranean postal subways running in tiny tunnels to massive operations beneath New York's skyscrapers, discover how stealth, automation, and gravity-defying counterbalances keep the modern world moving.

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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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Discover the best science, technology, and engineering shows. Explore amazing experiments, groundbreaking inventions, and the secrets behind incredible builds. Ignite your curiosity!

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#science #technology #engineering #railway