Not enough lube on the Tube?

So the train pulls away from, say, Bank station, as it goes round a bend and passengers are greeted with an almost deafening high-pitch scream.

Over the last couple of weeks, it seems the Northern line is the worst affected, though in the past I've experienced Central line trains in and out of Bank (mainly during summer months) testing my hearing to the limit.

I had intended to record the offending noise and put it up on the blog, but let's face it, it wouldn't be a popular clip.

Is it rails expanding in the heat? Or the brakes? What say Transport for London?

At certain locations depending on the geometry of the track and the weather conditions there can be high noise levels.

We control this with track lubrication but getting the correct amount of lubrication on the track is an exact science and we are constantly adjusting and readjusting it to get the balance right.

However there is always going to be some noise when you have steel wheels on metal tracks.

In a straw poll to find the worst affected lines, some of your responses to @BBCTravelAlert on Twitter were as follows:

@silken1987 - I'd say the central line is a good contender! Have to turn the volume all the way up on my mp3 player lol

@EdwynUK - Central line is ear splinteringly loud

@CazRudd - The Central Line, especially on the section between Stratford and Mile End is very noisy.

Any more for any more? TfL are aware of the issue and say they are doing something about it, but just how noisy are you finding the Tube when the weather's warm?

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