Eurostar staff are set to strike for 48 hours in a dispute over working conditions at the train operator’s London terminal.
Rail workers union RMT said its members would take industrial action between 00.01 on Sunday 30 September and 23.59 on Monday, 1 October.
The union said the international terminal at St Pancras station in London has been “reduced to chaos” due to Eurostar’s service failures and train breakdowns this summer.
RMT general secretary Mick Cash said: “The conditions at St Pancras have been simply appalling over the summer with dangerous levels of overcrowding on the concourse as services plunge into meltdown on the cusp of the busiest part of the year.
“RMT will not tolerate a position where our members are left to pick up the pieces due to corporate failures.
“Eurostar train managers are now joining this dispute after a recent ballot and will also be striking alongside their station staff colleagues.
“The union remains available for genuine and serious talks that will bring about guarantees to resolve the situation.”
A Eurostar spokesperson said: "We are aware of the proposed strike and are disappointed that this action is planned. We are meeting with the RMT next week to discuss this further and hope to find a solution."