Episode guide
Series 1
Impossible Railways
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Urban Adventures
From an inverted monorail in Germany to London's epic Crossrail project, discover how ingenious metropolitan railway engineering helps keep our cities running.
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Into the Wild
From a canyon-spanning bridge in San Diego to a track ascending an imposing Swiss peak, hear how railway engineers have conquered jungles, deserts and mountains.
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Crossing Chasms
From the iconic Forth Bridge to a vertigo-inducing viaduct in rural New Zealand, discover how railway engineers have conquered valleys, canyons and waterways.
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Reaching New Heights
From tunnelling through the mighty Swiss Alps to overcoming a cliff face in Southern Australia, see how railway engineers have skilfully conquered mountains.
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Need for Speed
Trains can now reach inconceivable speeds, thanks to pioneering engineers. Hear how mighty steam trains, supersonic rocket sleds and 'hovering' trains came about.
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Waterworld
From crossing the cyclone-prone Indian Ocean to travelling under the Bosphorus strait, discover how railway engineers have overcome the challenges presented by water.
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Series 2
Impossible Railways
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Extreme Wilderness
Since their meteoric rise in the 19th Century, railways have been at the forefront of modern engineering. They've conquered dizzying altitudes, wilderness, seas and cities.
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Building Bridges
Since their rise in the 19th Century, railways have been at the forefront of modern engineering and transport, conquering dizzying altitudes, wilderness, seas and cities.
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Into the Blue
How some of our greatest railways have challenged engineering's finest minds in their efforts to conquer the planet's waterways, including a tunnel beneath the English Channel.
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The Sky's the Limit
Engineering that has overcome some of the greatest mountain ranges to create innovative railways, including a tunnel in the Swiss Alps and a zig-zag railway in Ecuador.
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Full Throttle
Engineering breakthroughs that allow trains to go faster than ever, including technology that allows the navigation of the winding mountains of Spain at speed.
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City Limits
A look at the planet's most incredible metropolitan railways, and how they help people solve distinctly urban problems. Including a project to upgrade New York's transit system.
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