Commuters say the stifling heat on the Tube is “torture” as they have called for Transport for London (TfL) to deal with the matter.

The Metropolitan Line, Hammersmith and City Line, Circle Line and District Line are the only routes which are air-conditioned.

This morning, the Northern Line climbed to 31.8c – above the legal limit to transfer cattle, which is 30c, according to ITV.

Meanwhile last night, it was nearly 40c on the Central Line – and this morning after it emptied it was still only in the low 30cs.

Now people say it could have dramatic repercussions on their health.

Commuter Ben Jackson, who lives in Archway, takes the Northern line to his job in Camden each morning, said: “It’s sweltering. Sometimes it’s unbearable to the point that I feel like I’m going to faint. By the time you get off the train you’re gasping for air it’s so hot.

“It’s like being in a sauna, I dread it.

“It seems ridiculous that in 2018, not all of our tube lines are air conditioned. It’s a matter of basic health and safety.”

Jim Wright, who works at Wembley Stadium, commutes from Canons Park on the Jubilee Line each morning.

He said: “It’s torture. I can’t stand it, sometimes, the heat makes you feel sick.”

He also questioned why the Metropolitan Line is air conditioned while the other tube lines are not and branded the situation a health issue.

“The Met Line is lovely and cool,” he added. “But it’s not enough to air con one or two lines. It’s unfair on paying customers.

“We spend so much money on commuting because we have no choice but are forced to travel in unsafe conditions.”

Emma Walsh, who commutes to Bank on the Northern Line every day described the heat on the Tube as “sticky” and said it makes her “really sleepy”.

Austen Williams, who travels from Finchley Central, said he gets a headache from the heat and “smell of sweaty bodies”.

Local politicians have also been quick to wade in on the debate.

Cllr Michael Duffell , who represents South Woodford, said he cycled 25 miles yesterday to and from work to avoid the Central Line.

Cllr Khayer Chowhury , who represents Valentines ward in Redbridge, described the heat on the Central line as “unbearable”.

He said: “Rail companies in this country, including TfL, need to stop taking us for granted.

“We need and want cooler trains, trains with more capacity, and train services which are reliable. These companies need to stop treating us worse than animals.”

Keith Prince, London Assembly member for Havering and Redbridge, said: “I am extremely worried about the levels of heat which commuters on the tube network are having to cope with. Soaring heat is a health risk and TfL must make sure that passenger safety is their priority in such temperatures.

“This raises the issue of how TfL can better manage funds to improve customer experience in the future, but with temperatures set to rise the focus for now must be on commuters’ health and safety.” spokesperson for Transport for London (TfL) said the transport body is “investing millions” to make Tubes cooler for customers.

The spokesperson added: “During this hot weather we advise customers to ensure they have water with them when they travel in order to stay hydrated, offer a seat to those who may need it, and, if they feel ill, to contact a member of staff at the next station.”