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After 25 years in business, Eurotunnel is at a junction, with many of its staff facing retirement and new recruits being drafted in. And the next batch of wannabe shuttle drivers has just arrived for the first round of testing. But the tests are ruthless, with a 90% fail rate, so who will make it through? Meanwhile, inside the world’s biggest train shed in Calais, we see how maintenance teams keep the locomotives running. And in Folkestone we meet the UK team hard at work in the slightly smaller UK shed.