torsdag, 12:30 
Inside the Factory
Trains, E2, S7
Gregg gets special access to learn how the ultimate train is made: a huge 187-tonne, five-carriage electric train. Meanwhile, Cherry Healey visits an HS2 construction site to learn how two huge tunnel boring machines are digging ten miles through the hills. And historian Ruth Goodman is energised by the history of electric trains.