Work on a second major upgrade on the Coleraine to Londonderry railway line has been delayed by four months.
The work, originally due to start next month, is now planned to begin in September subject to a procurement process.
£16.2m has been allocated to Translink for the railway upgrade.
Last year, Translink said an hourly service on the route was a “priority”.
The second stage of the upgrade involves major re-signalling between Derry and Coleraine and the introduction of a passing loop.