More than 150 railway workers in Northern Ireland are to go on strike over pay and conditions.
Conductors, station and platform staff will take part in industrial action beginning at midnight next Monday.
The Union GMB said it would last a day.
The strike has come about after railway workers and management refused to agree to cost-saving measures such as changes to sick pay.
A spokeswoman for train operator Translink said the organisation was working hard to resolve the matter.
GMB regional organiser Michael Mulholland said: "GMB members, who are mainly from the conductor and station staff grades, believe that they are being asked to give away too much to fund increases for other groups who have not."
Mr Mulholland said all other unions had accepted a three-year deal through the agreement of efficiencies, such as changes to company sick pay and increased flexibility.
A Translink spokeswoman said: "A small number of railways staff have indicated they will take strike action on Monday 24 June.
"Rail services will be affected by this strike action and we will keep our passengers informed as more information becomes available."
Bus services will not be affected.