Headhouse

Several members cast it as an either-or issue, pitting the form of the headhouse against the function of the passageway.

HS2 Ltd has unveiled the final design for the Little Missenden ventilation shaft headhouse on the ten-mile-long Chilterns Tunnel. Its single-storey design is said to have been inspired by barns and historic agricultural buildings in the area. [...] The headhouse will sit above a ventilation shaft 17.4 metres in diameter and 30 metres deep.