Contracted out caterers working on TransPennine Express services will take strike action on Friday over poor pay, pensions and sick pay.
RMT members working for Rail Gourmet poorer terms and conditions and lower pay than directly employed colleagues who work on the train operator.
Rail Gourmet made £1.4 million in profit last year but have refused to meet the expectations of members in terms of a pay offer.
RMT General Secretary Mick Lynch said: “The continuing intransigence by Rail Gourmet bosses is unnecessarily prolonging this dispute.
"Our members remain determined to continue their industrial campaign until they achieve justice on pay, sick pay and are awarded a decent pension.
"TransPennine Express as the company that contracts out its catering services needs to step in and pressure Rail Gourmet to deliver on our members demands."