Charlotte Smith visits a farm that will be cut in two by the new high-speed rail link.
From sewage treatment to Crossrail, engineer Ailie MacAdam talks to Jim Al-Khalili.
Jonathan Freedland takes the Long View of the fate of great British building projects.
How 26 miles of precision-engineered tunnels are created through London's erratic geology.
Who are the winners and losers from high-speed rail?
The morality behind Nimbyism and the HS2 project. Debate chaired by David Aaronovitch.