The move comes after a new timetable was set to be implemented in the coming weeks, with significant increases in the journey time to Dublin expected.
Chris LYttle MLA said: “I am glad that Translink and Iarnród Éireann have accepted the need to get this essential service right.
“The Belfast to Dublin Eastern Corridor is vital to the economic success of Northern Ireland and it is essential we get this right.
“I think Translink and Iarnród Éireann’s recognition that there are problems with the current plans and their desire to deliver a first-rate service should be welcomed.
“I would urge the Regional Development Minister to show leadership on this issue and anyone with an interest in the Belfast to Dublin rail line to get involved with the consultation and express their views.”