Cool comforts

The author looks at engineering solutions to the age-old problem of cooling the London Underground. London Underground introduced a programme 'Cooling the Tube', which is ongoing. David Waboso, director of London Underground Upgrade, points out that there are two types of lines on the Underground's subsurface averaging about 5m (16ft 5in) below the surface and deep level, about 20m (65ft 7in) they both require different approaches. He believes the subsurface lines can be controlled through air-conditioned trains being deployed.