The Sky's the Limit

For over 150 years, our railways have been pushing engineering to its limits, in order to open up our world. Trains can now travel further, and climb higher, than ever before. But for train engineers, it's the need for speed that has inspired the greatest innovations of all.
From the technology that allows trains to navigate the winding mountains of Spain at speed, to the machines that allow engineers to lay tracks in record-breaking times and the super-fast new form of transport for the future, Hyperloop One; this episode investigates the incredible engineering breakthroughs that allow trains to go faster than ever thought possible.
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