Rail passengers travelling from Coleraine to Derry-Londonderry face disruption for the next four weekends.
It's to facilitate major engineering works.The first railway line closure is this Sunday.
Other closures will take place on Sunday August 28, over the weekend of September 10 & 11, and Sunday 18 September.
Translink have arranged bus substitution services during these closure periods and passengers will also be able to travel with valid rail tickets on local
scheduled bus services.