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Tube drivers are set to be given ear defenders after threatening industrial action over “screeching” noises from new tracks.

The problem is said to be worst on the High Barnet branch of the Northern line, in particular between Euston and Tufnell Park and around Finchley Central.

Noise levels of up to 109.5 decibels have reportedly been recorded, akin to the volume at a rock concert.

Concerns were raised with Tube bosses by drivers’ union Aslef. Drivers are already supplied with ear plugs but union representatives wanted headphone-style ear protectors.

Complaints have also been received by TfL about noise levels at Hendon Central, on the Edgware branch of the Northern line.

The Victoria, Jubilee and Central lines also suffer from high noise levels. An Aslef spokesman told the Standard: “Within two weeks we will have the ear defenders. Effectively TfL have agreed to do what we asked for.”

Mayor Sadiq Khan said TfL has been considering using speed restrictions to reduce the noise — as long as that did not result in services being delayed.

Aslef believes a track fastening system called Pandrol Vanguard, which reduces vibration in tunnels, is to blame for the increased noise.

This has been used on Tube modernisation schemes on the Victoria and Northern lines. TfL has been conducting trials of under-rail pads and dampening systems to reduce noise. The move from wooden to concrete sleepers may also be a factor.

Mr Khan, in a written answer to the London Assembly last week, said: “TfL is currently reviewing what criteria should be used when assessing requests for speed restrictions. Clearly, the use of speed restrictions needs to be carefully balanced against providing a level of service that London Underground customers reasonably expect.”

TfL reduced noise levels by about 10 decibels near Finchley Central by adding lubricant to an area of track. TfL said it aimed to keep noise levels experienced by drivers below 77 decibels. It said limits set by the Health and Safety Executive were based on exposure over an eight-hour period — meaning most passengers were unlikely to breach the limits.

A TfL spokeswoman said: “The health and safety of our staff is something we will never compromise on, and we regularly monitor noise levels on the Tube to ensure it remains below HSE limits.” She added staff were offered a variety of ear protection to make them feel more comfortable.