The rail squeak, as it is more technically known, is what causes the noise in some areas of the network. It is created by the metal wheels against the curve in the tracks.
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Dr Sollini told the programme: “The Central Line has the loudest section out of all of the Tube lines, and it basically gets as loud as almost 110db, to put that into perspective that is approximately as loud as going to a gig or rock concert.
A Groan Tube is a toy, which when turned on one end, makes a distinct 'groan' sound. This is due to a noise maker in the tube, that when it falls, vibrates in the air making the noise. The groan tube was invented in the early 1960s by Japanese toy manufacturer Kureo. The toy was first sold as 'Magic Noise Tube (????).
The Metropolitan line is the oldest underground railway in the world. The Metropolitan Railway opened in January 1863 and was an immediate success, though its construction took nearly two years and caused huge disruption in the streets.
Revealed: These are London's most overcrowded Tube linesStatistics from mayor of London Sadiq Khan show that morning peak hour capacity on the London Underground is more than 100 per cent, with the Northern, Central and Jubilee lines the most crowded.
Anyone disturbed by the Night Tube or everyday Tube services can contact TfL's 24/7 Customer Service Centre on 0343 222 1234 or www.tfl.gov.uk/contact.
But Greenwich stood out as the friendliest of all 32 boroughs, scoring highly across the board. Residents of the south-east London borough boasted of their sociable neighbours and feeling safe in the “beautiful” area.
Remember the 'rush hour'The London Underground is very busy during 'rush hour' with commuters moving around the city. You can expect the trains and stations to be overcrowded between 7.30AM and 9AM in the morning and between 5PM and 7PM in the evening.