Rail Gourmet workers on Eurostar were set begin a 48-hour strike from 7pm on Thursday of this week.
A 24-hour strike earlier in the week was scrapped in favour of the escalated action.
The workers’ RMT union said they were angered by the company’s “derisory” pay offer.
They are demanding that Rail Gourmet bosses offer a “significant increase” to pay and improvements to terms and conditions.