Going behind the scenes of the world’s oldest, biggest and busiest underground train network as it undergoes the biggest overhaul in its history.

The series follows key members of the London Underground’s 19,000-strong staff, from CEO Howard Collins through to the litter pickers who clear miles of track every night. Drivers, station staff and emergency response workers reveal their unique perspective on the travelling public. Capturing The Tube in all its guises, from tourist transport to suburban commute, or the last train home for partygoers, this series also looks behind the scenes of the tube’s ten billion pound upgrade – and how the process of dragging a Victorian infrastructure kicking and screaming into the 21st century doesn’t always run on rails.