Engineering a great bit of telly

THE £ 15BILLION RAILWAY – BBC2, 9pm

PART one of two. Return of the documentary about the construction of the Crossrail train line linking east and west London, following those racing to complete the work in time for the first trains to run in May.

Engineer Linda Miller and her team must battle ancient fault lines that threaten the Farringdon station site with flooding, while construction workers build innovative floating rail tracks directly under the Barbican Concert Hall. Fascinating stuff.

Julian Barratt narrates.