The Tube - Season 1 Episode 4 Upgrading the Tube

Faulty doors and a signal failure cause major delays on the Victoria Line, where head of upgrades David Waboso is trying to work on a solution to the network's trebling of passengers over the past 10 years. Meanwhile, supervisor Barry Griffiths endeavours to keep the crowds moving at Tottenham Court Road as work continues to make the station six times bigger.