Incredible thermal images captured today show the tropical heat commuters are braving on the London underground.

It was always set to be a hot one today, but thermal imaging done by Flir shows the soaring temperatures commuters have been facing on their way home- with some underground trains getting to a roasting 105F.

People making their way home in this unprecedented heatwave are pictured looking a bit fed-up and irritable on the tube this evening.

London Underground staff today urged bosses to allow them to wear shorts as temperatures on the network soared past 104F (40C).

Employees have also urged Transport for London executives to ensure their mess rooms are air conditioned and have chilled drinking water during the heatwave.

It comes as London commuters faced another sweaty commute today just hours after heading home in temperatures of 97F (36C) inside crammed Tube carriages.

Passengers on the Central line took to Twitter to complain they felt like they were 'gonna die', 'almost fainted' and that the carriages were like a 'sauna'.

And thermal imaging cameras from Flir showed how temperatures on the Central line platform at Holborn Underground station reached 113F (45C) yesterday.

And staff in old and poorly ventilated stations are also suffering in temperatures that are above the European Union limit of 86F (30C) for transporting cattle.

A thermal image from Flir showed the temperate ranged from 89.98F to 104.54F in a packed Central Line tube

London commuters crammed inside a packed Central line train where temperatures are soaring

Passengers had no option but to travel in sauna-like trains with very basic air conditioning on the Central Line

Passengers on the Northern Line tube where temperatures ranged from 88.52F to 99.32F

Commuters struggle on a stuffy Victoria line train on the Underground this morning

The Jubilee line sizzles in temperatures ranging from 87.44F to 98.42F. The conditions have been described as like a 'sauna'

A woman fans herself on a hot Victoria line train during the London heatwave this morning

Commuters try to stay cool on the Victoria line as it is hit by further soaring temperatures

People travelling on the Northern Line captured by the Flir Thermal imaging camera, temperatures ranged between 87.8F and 98.78F

Flagging commuters struggle in the heat in the London underground as Britain continues to sizzle with temperatures getting as high as 104F on some underground trains

Temperatures on the Piccadilly Line also climbed high, ranging from 91.4F to 102.56F

Commuters struggle in the heat on a busy commuter train. People have been advised to carry a bottle of water with them

A busy underground commuter train on the Central Line where temperatures are ranging between 91.22F and 105.26F

Commuters cram themselves into the red hot tubes. People have been taking to social media to complain about the searing temperatures on the underground all week

Temperatures on the Jubilee Line ranging from 87.44F to 98.6F. The thermal images have been taken by Flir and show the temperatures commuters are battling this week

The complaints came from the Twitter account of Tubeworker Bulletin, which is written by and for Underground workers and published by Workers Liberty.

It said: 'Temperatures on London Underground are pushing 40C in the heatwave. EU legislation stipulates that it's illegal to transport cattle in temperatures higher than 30C.

'Many mess rooms are not air conditioned; many don't have chilled drinking water.

'There is a uniform trial currently underway to see if station staff will be allowed to wear shorts. LUL (London Underground Limited) has historically opposed this because they claim it looks 'unprofessional'.

'Many Tube workers, such as cleaners in central London stations, will spend the majority of their shift at platform level, where temperatures are particularly high and ventilation is often poorest.

Travellers on the Northern Line facing temperatures ranging between 89.24F and 99.5F

Commuters sat today in rush hour trying their best to stay cool while the temperatures on the tube soar

The Piccadilly Line getting from 89.24F to 98.6F. It is recommended you take a bottle of water with you when travelling on public transport at the moment

'Now, we get we're not salt miners or anything, but the situation is a little galling when one considers that the offices of senior management are most definitely air conditioned.

'As a minimum, we demand access to chilled water for all staff; the right for station staff to wear shorts; and proper air conditioning and ventilation in staff mess rooms.'

It comes as City workers wiped the sweat from their brows, buttoned down their shirt collars and rolled up their sleeves as they face uncomfortable journeys.

While Britons basked in the sunshine - with a year high 91.9F (33.3C) in Suffolk yesterday - London commuters entered the depths of the stuffy Underground.

The complaints came from the Twitter account of Tubeworker Bulletin, which is written by and for Underground workers and published by Workers Liberty

A Flir thermal imaging camera showed how temperatures on the Central line platform at Holborn station reached between 93F (34C) and 113F (45C) yesterday

Thermal imaging on a Central line carriage at Holborn found temperatures ranged from 90F (32C) to a high of 109F (43C)

The mercury went from 86F (30C) at the entrance to Liverpool Street station to 91F (33C) on the platform of one of the capital's deepest and oldest Tube lines.

The red hot Central line has been clacking through the tunnels with basic air ventilation systems since 1900. It's London's longest Tube line at 34 miles long.

Passengers had no option but to travel in sauna-like carriages, where the temperature rocketed to a baking 97F (36C).

Sarah Gordon, a lawyer from Finchley Road, North London, usually avoids peak times in the heat and enjoys the delights of the air-conditioned Metropolitan line trains.

But she was outraged by the Central line conditions as she travelled through its busiest stations at 6.30pm to try on bridesmaids' dresses at Oxford Circus.

Commuters fanned themselves down on a Central Line train during their sticky, stuffy journey

A thermometer reads nearly 100F on a Central line tube train yesterday evening

The 35-year-old said: 'Knowing it is 36C (97F) down here is shocking - that is almost body temperature.

'It is awful when you get on a train as normal and you leave soaked through with sweat.

'I am going to try on bridesmaids' dresses for my best friend's wedding and it will feel absolutely disgusting and sticky after this journey.

'If this was my commute I would want to work from home or move home or job to avoid the hot, sweaty journey.

'You would need to go home and shower before doing anything else.'

A young girl tries to cool herself down with an electric fan as her family squeeze into a carriage

A woman clutches a bottle of water in an attempt to keep hydrated on the Central line

A woman waves a fan in the direction of her friend to try keep her cool while riding the train

Passengers were on top of one another in the sweaty carriages where it was almost 100F

Sam Mitchell, 27, is a trainee solicitor who uses the Central line to commute from East Acton in West London to St Paul's every weekday.

He often waits 15 minutes fighting for a space on an overcrowded carriage and said the worst part of his 35-minute sweltering journey is between Marble Arch and St Paul's where overcrowding is pushed to the maximum.

He said: 'This commute in this heat is the worst way to start my day. It is really uncomfortable. There is no air conditioning which is appalling.'

Michael Obire, 25 of Marylebone, has started taking a longer, alternative route to commute to his job as a sales executive at St Paul's.

The Central line has been travelling with basic air ventilation systems since the year 1900

City workers wiped the sweat from their brows and buttoned down their shirt collars

Commuters ride a packed Central Line Tube train in London during high temperatures

Mr Obire said: 'My tactic is to stand next to the carriage door window where you can catch a slight breeze. The Central and Northern lines are the worst.

'It is too hot down there. They are the most crowded, especially in zones one and two. I avoid it when I can in this heat.'

Kavina Depala, an 18-year-old sales executive, takes the Central line from Tottenham Court Road to St Paul's as part of her daily commute from High Barnet.

She said: 'I dread the rush hour. It's really hot and stuffy. There are so many people and it is boiling on the train.'

Asked about the workplace demands of the Tube workers, Nigel Holness, Director of Network Operations for London Underground, told MailOnline: 'Tube station staff play a vital role in keeping our city moving, and we're determined to make stations more comfortable working environments during the summer months.

'We are investing millions of pounds to make the Tube cooler and are constantly working on new ways to keep the temperature down. We have doubled the number of fans on the network since 2012 have installed chiller units to pump in cold air.

'We have also started a 12-week trial on shorts as part of the uniform for station staff, and we are actively looking at improvements to air conditioning units in staffrooms. We also provide water at every station for our staff.'