The works will see a further 3.5 miles of track renewed on the line which, combined with previous works, will facilitate journey time improvements on the line at the next timetable review, planned for the early months of 2022.
As a result of these works, all services on the line will be replaced by bus transfers for the five-week period.
Bus replacements will depart at scheduled train times, except for the 7:45am Nenagh to Limerick service, which will depart at the earlier time of 7:30am, serving Birdhill at 7:51am and Castleconnell at 8:04am.