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A fire alarm leads to the station being evacuated, safety checks to the tunnels below the station reveal some fascinating secrets and soaring temperatures threaten to derail the Bank Holiday getaway.
Temperatures soar in the height of summer, warping iron tracks and delaying trains. Problems are also caused by trespassers on the line, suspected drug users and an electrocuted pigeon.
Signal problems lead to a restricted service during rush hour, which causes severe congestion at the station. Twenty four hours later, the same signal causes more problems, which leads to the complete suspension of the line. And a team of engineers try to replace 60 feet of track in just four hours.
The return of the programme that goes behind the scenes at London's transport hubs, this time meeting the army of workers who keep Paddington station running.