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"In exactly four years' time, Europe's biggest infrastructure project will open to the public.
"Crossrail is a new railway line running from east to west across London. It sounds simple enough but this is a project on a scale that echoes the great Brunel himself.
"It includes 26 miles of tunnels and we were lucky enough to go down a few, just to see how they are getting on.
"I say lucky. You should try climbing down 50 metres of claustrophobic metal staircase in full safety gear and carrying all the camera kit."