Belfast's new £340 million public transport hub opens to passengers this weekend.
Grand Central Station is being described as a "game-changer" for bus and rail services in Northern Ireland and across the island.
The new facility is on the Grosvenor Road, a ten minute walk from the city hall.
The first service to leave on Sunday morning will be a cross-border bus to Dublin.
The new concourse accommodates both rail and bus, but it will be some time before cross-border train services are able to use the facility.
That is because testing has still to be completed on new track and signalling installed as part of the project.
The date for the start of rail services from the station will be announced in due course.
The original business case put the cost at around £300m.
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The project is on time. The additional £40m spend has been put down to inflationary pressures caused by the Ukraine war and the fact that building work began during the Covid-19 pandemic.
The contractor said at one point it did not know whether it would be able to source the necessary steel for the build due to the conflict in Ukraine.
70% of the companies that worked on the project were from Northern Ireland.
A Dublin-based firm did the glazing and the glass was manufactured by a company from Co Tipperary.

Grand Central Station will be the biggest integrated public transport hub on the island.
However, there is a dispute over signage in the new station.
Irish language activists had urged Translink to consider bilingual signage throughout the building.
They had the support of Belfast City Council and the Infrastructure minister John O'Dowd of Sinn Féin.
But it appears as if Irish, for now, will only appear among other languages at a central welcome desk.
Translink says it is continuing to consult on the issue.

Chris Conway, Translink Chief Executive, says the new station is a "world-class facility".
"This will be a game-changer for public transport in Northern Ireland.
"It'll enhance connectivity right across Northern Ireland, we have the capacity now to grow services, connecting towns and cities right across Northern Ireland, this is really the hub of our network.
"We can also grow connectivity across the island of Ireland as well with new hourly rail service coming in between Belfast and Dublin."
That new hourly train service between the two cities is due to start later this year.
It is being supported by €25m from the Irish Government.