Oxford Circus and Green Park Tube platforms cooled
Platforms at two major central London Underground stations are to be cooled, Transport for London (TfL) has said.
Cold water from a borehole will be piped into units which will reduce the temperature at Green Park.
And at Oxford Circus, chiller units are being installed to blow out cool air.
TfL has made cooling of the Tube one of its priorities and it is hoped the work at the two stations will be completed in the summer.
In August, the first air-conditioned Tube trains went into service in the Metropolitan Line and TfL said it plans to roll the trains out across 40% of the network by 2015.
And a cooling system similar to the one being implemented at Green Park using underground water, is being used at Victoria station.
But last year, TfL was criticised after new trains on the Victoria Line emitted heat raising temperatures on platforms but that fault has now been corrected.
A heat map that monitored the London Underground on 28 July 2008 - one of the hottest days of that year - found the Central Line was the hottest, with temperatures of up to 32C (90F).
The Metropolitan Line recorded temperatures of up to 27C (81F).
The Jubilee Line was significantly cooler with most stations recording temperatures of 25C (77F).