Current traffic patterns Limerick - Limerick Junction don't indicate a need for doubling. If any freight appears it can be diverted via Nenagh if possible. There is an option for a longer passing loop at Dromkeen. Current scheduled time is 25-28 minutes which is generous, capacity currently is good for 2 trains an hour in each direction with a reasonable amount of leeway. You can pass trains at Limerick Junction, Dromkeen and have several miles into Limerick also.
Schedules between Athlone-Portalington / Mullingar - Maynooth suffer very badly due to the need to pass trains.
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