UK set for new railway strike
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The RMT insists action is necessary as wages have failed to keep pace with inflation, which has hit a 40-year high and is on course to keep rising.
The union wants also a threat of compulsory redundancies withdrawn.
"Strike action is the only course open to us to make both the rail industry and government understand that this dispute will continue for as long as it takes, until we get a negotiated settlement," RMT general secretary Mick Lynch said in a statement.
The RMT held three strikes last month that crippled services across the country.