From an inverted monorail in Germany to London's epic Crossrail project, discover how ingenious metropolitan railway engineering helps keep our cities running.

From a canyon-spanning bridge in San Diego to a track ascending an imposing Swiss peak, see how railway engineers have conquered jungles, deserts and mountains.

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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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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