The European Union is to invest £17 million in two cross-border railway projects in Ireland.
Carriages for the Belfast-Dublin Enterprise service will be refurbished and work on the Boyne viaduct in Drogheda, Co Louth, is included.
The projects are scheduled for completion in 2015.
The Department for Regional Development (DRD) in Northern Ireland and the Department of Transport, Tourism and Sport (DTTAS) in the Republic are to match the EU funding.
A total of £12 million has been allocated for an upgrade to the Enterprise service.
The EU is also providing funding for work on the viaduct, which carries the line across the River Boyne.
Work on the span, which was built in 1885, will include a drainage system, steel repairs and track renewal.
Pat Colgan, chief executive with the Special EU Programmes Body (SEUPB), said: “Both projects will enhance one of our main cross-border infrastructure links, thereby supporting trade and tourism development for a more prosperous and sustainable region.”