The majority of delays are on the NIR side and have been for some time
And as Translink admit
Quote:
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PASSENGER INFORMATION: Enterprise Services - Due to essential maintenance works delays of around 10 minutes are anticipated on all Cross Border rail services until further notice. Everything possible will be done to minimise delays. NI Railways and Iarnród Éireann apologise to all passengers for the inconvenience caused.
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This is due mainly as a result of speed restrictions over long sections in Northern Ireland which were not relaid during the upgrade program
There are several bad sections on both sides of Lisburn