As preparations for the Twelfth get underway, Translink is advising passengers that a special timetable will be in force on Monday July 13 and Tuesday July 14.
In Mid Ulster, the Goldline 209 service from Cookstown and Dungannon to Belfast will not be in operation on both days.
The Ulsterbus 80 service between Cookstown and Dungannon has also been cancelled, but the Goldline X4 bus from Derry-Londonderry to Dublin via Cookstown and Dungannon will be running as usual.
As well as these local changes, the Belfast Metro service will be working on a public holiday timetable next Monday and Tuesday.
Some Goldline services will be providing a usual service, while others will operate a public holiday timetable on these dates.
And in relation to NI Railways - they will be operating a Saturday timetable on July 11, 13 and 14.
For more information contact Translink on http://www.translink.co.uk.