The prime source of this noise appears to be the bend in the track north-east of Finchley Central, but also along the tracks that have been replaced, both on the Barnet and Mill Hill East lines.
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TfL engineers consider any possible noise and vibration implications before undertaking all track renewals. In the Finchley Central area, the cause of the noise is the result of the interaction between the wheel and the rail.
The line is used by more than 900,000 passengers a day and more than 200 million passengers a year. The Northern Line features the London Underground's deepest station (58.5m below ground level) at Hampstead.
The Victoria Line is teeming with bacteria, having the highest number of germs of all the Tube lines. Touching your face after coming into contact with dirty seats and handles can transfer a whole host of blemish-causing bacteria.
The Waterloo & City and the Jubilee were the coolest lines, while the Metropolitan and Hammersmith & City attracted fewest complaints. TfL said air-conditioned trains were in use on 40 per cent of the Underground network. New trains due to be introduced on the Piccadilly line from 2025 will also have air conditioning.
The Central Line was opened in 1900 and is forty six miles long, making it the longest line of the system, between the stations of West Ruislip and Epping. The Central Line is one of only two lines which have stations outside the boundaries of Greater London.
The Central line is a London Underground line that runs through central London, from Epping, Essex, in the north-east to Ealing Broadway and West Ruislip in west London. Printed in red on the Tube map, the line serves 49 stations over 46 miles (74 km), making it the longest line on the Underground.