The ORR investigation found the design of the trains complied with existing standards but that corrosion cracks were found on lifting points – which allow carriages to be raised during maintenance work – resulting from the use of a particular type of aluminium, which was corroded by salt in the air.
https://www.bbc.co.uk/news/uk-england-61021701?at_medium=RSS&at_campaign=KARANGA,
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