The London Underground line that is nearly 40C during the heatwave (opens original article in a new tab)

London Underground temperatures hit 39.4C on the Central line during a heatwave, with only 40% of trains having air conditioning.

• London Underground temperatures reached 39.4C on the Central line during a heatwave.
• Only 40% of trains have air conditioning, with some lines at 22C.
• Commuters used the Tube despite extreme heat, with some having air-conditioned offices.