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With the population of London already at a record high of eight million people and expected to grow by another million people in the next six years alone, the Tube is preparing for a busier future. This time, we follow lead engineer Anita, as she digs new passenger tunnels 100ft below Bond Street station.
Tonight, the Tube takes on more than a thousand new staff but the newbies are joining a very different Underground, one that now faces a level of terror threat unknown in the past.
The Tube is embarking on a crackdown on fare dodgers to help pay for a massive upgrade of stations and trains. Fare dodging costs the Underground £34 million a year, so revenue inspectors Simon and Paul have their work cut out for them. At Angel station, they face an aggressive passenger who refuses to pay.
Tube staff face their busiest, most unusual shift of the year. With a million passengers expected, New Year's Eve is the only night of the year when Tube trains run for 24 hours. Hundreds of staff have signed up for the extra shifts but they never know what the night will bring. This year, the whole network is on high alert following terrorist attacks in Paris.