Extra security has also been added.
Late-night commuter trains and DARTs make a return across the county from today.
The services will operate every Thursday, Friday and Saturday over the next three weekends in the run up to Christmas.
While extra security has also been added.
Meanwhile, the rate at which DARTs are arriving late is being described as poor and a concern.
The National Transport Authority says just 71 per cent of services are showing up within 5 minutes of their scheduled time during the evening rush.
Irish Rail says changes to the timetable and the annual leaf-fall season have made it a challenging few weeks, but improvements are on the way.