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The hottest platforms on the Tube network were revealed today as Londoners battled through a week of sweltering conditions underground.

Temperature readings taken in the height of summer reveal Marble Arch on the Central Line to be the hottest, hitting an average temperature of over 30C last August.

The average reading for the month of August last year was 31.69C, statistics from Transport for London (TfL) show.

Neighbouring Bond Street came a close second with temperatures hitting 31.48C, according to the data obtained by the Londonist.

Londoners using Paddington’s Bakerloo line platform faced an average high of 31.19C.

Amid calls for improvement work to cool the Tube down, it emerged the stop at Heathrow Terminal 5 was the 'coldest' station.

Its monthly average was 20.97C.

In a bid to keep customers cool TfL staff ordered 250,000 bottles of water to hand out across the network.

Earlier this week temperatures on buses reached 36C and 33C on the Central Line.

At 5.46pm on Monday on the Central line at Oxford Circus, the Standard recorded 33.4C heat and humidity at 39 per cent. Temperatures soared further along the line where the humidity reached 50 per cent and 33.7C at 6.20pm at Bank.

Daniel Popplewell, 27, who works in events, was at Oxford Circus travelling home to Muswell Hill.

He said: “It’s not nice travelling to work and when you get there you are already sweaty and you have to start grafting.

“It’s bad. It’s a sweat box. The Overground is really nice, whenever I get on it’s fridge temperature it’s lovely. I don’t know if it’s harder for the Underground or they don’t have the funds. They could do with some air conditioning.”

John Goodman, 51, a solicitor, was travelling home from Tottenham Court Road to Whetstone on Monday.

He said: “On a day like this the Northern Line is pretty awful. It’s like a sauna. I think it’s a combination of when the train is absolutely packed and it is like a steam bath.

“It’s horrible. They should invest in air conditioning. The air conditioning you get doesn’t seem to make a difference – you hear the fans but its’ still seriously hot.

“In New York you get these incredibly cool trains – you get hot platforms admittedly – but fantastically cool trains.”

A TfL spokesman said: “Carry water with you and don't board a train or bus if you feel unwell.

“If you feel unwell please get off at the next stop and seek help from our staff.

“Avoid pulling the passenger alarm between stations as help can be more easily obtained on a platform.”