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Eurotunnel teams have a quarter of a century’s worth of experience in getting cars and lorries onto trains. It all hinges on a finely tuned system using letters to send the right vehicles to right trains. But when pre-Brexit passport checks cause slow coaches, how will the allocation team in Folkestone keep the endless stream of half-term holiday traffic flowing?

Meanwhile, with the 25th anniversary well under way, there is some extreme painting going on at both ends of the tunnel: two giant murals that will somehow link to each other across the sea. But how will the
painters work around the tunnel entrance when the trains never stop running? Inside the tunnel, those high-speed trains are being slowed down by the air they push in front of them. And the only way to relieve the pressure is with tubes connecting one tunnel to another. So how do those tubes work and what happens when they need to be repaired? Plus we take a trip on the catenary team’s revolutionary new camera van that will transform the way they look for faults and we meet the Tottenham and Liverpool fans heading to Madrid for the Champion’s League final.