Security guards working at Eurostar depots have voted unanimously to strike in a dispute over union recognition. The Rail Maritime and Transport union said workers employed by Chubb at stations in Ashford, Kent, and London Waterloo, backed the move on Wednesday.
The RMT said the 100% vote in favour showed the strength of feeling and a decision on strike days would follow.
A ballot has also been called among staff who provide services for Eurostar over the same issue.
The ballot for workers employed by Momentum Services Ltd closes on 11 August.