Pretty soon being on a cool tube will mean more than pulling into Brixton station and hearing "Dis is Brixton, man, dis train terminates 'ere" over the PA system.

According to King Boris, if you use the Metropolitan Line you'll be chilled out during your commute in 2010 and the following year you'll be needing a coat on to travel on the Circle and Hammersmith and City lines.  We should all be celebrating, but is it only me who thinks it’s a complete waste of cash?

Underground fares have gone through the roof in recent years and are set to increase further in January, I'd prefer to pay less and be sweating like a pig thanks.

To be honest I rarely use either line, so I may have a slight bias, but I do know that the majority of stations on all three lines are either above ground totally or just sub-surface.

They are never as stuffy as the perspiration-inducing Northern or Piccadilly lines, simply because they have more access to fresh air - each train on the Piccadilly Line has to go from Arnos Grove to Baron's Court without seeing the light of day a massive 21 stations, compare this to the four-station stretch the Met line does (Baker Street to King's Cross) and it seems a bit stupid to introduce them on here first.

It makes last week's announcement of "air conditioned underground trains" a bit misleading. They have effectively found a way to cool down an overground train - something every mainline train company in the country have already worked out.

They could have just asked South West Trains for these mystical answers. I wonder how much Londoners paid engineers to invent something that already exists?

It may be harder to work out a way to cool the hotter trains deep below London, but I'm sure more commuters would feel the benefit - travellers on the Northern Line always look far more miserable than their Met Line counterparts. There's a reason for this and it's not just because some of them live in Camden.

I'm also assuming TfL will be able to alter the air con on a day to day basis depending on the temperature outside. How many times will you get onto the train soaking wet from an autumn run to the tube station, only to get on and freeze to your seat because they can't turn the system off?

I don't want to risk hypothermia on my commute, I feel like I'm catching all sorts using the underground already!