Scarva and Poyntzpass stations will be closed on March 7 and 8 as Translink NI Railways is carrying out engineering works between Portadown and Newry.
A bus substitution will operate on some services between Belfast Central and Portadown on those dates.
On Saturday March 7 the Enterprise bus substitution from Central to Newry will depart 10 minutes earlier than the scheduled train departure time.
Train services from Newry to Dublin will be as per the normal Enterprise departure times. These trains will all be operated by Irish Rail sets on both days.
On Sunday March 8 the Enterprise bus substitution from Central Station to Newry will depart at the normal departure times.
All Enterprise services from Dublin will operate as per the normal departure times, with a bus substitution from Newry onto Portadown and Belfast. Substitution buses will depart from Newry ten minutes after the train arrival, however some delays can be expected.
Visit www.translink.co.uk for more details.