Iarnród Éireann says the railway line between Limerick and Ennis is set to re-open next month.
It follows extensive flooding on the line at Ballycar, which has seen it closed since December.
Bus transfers are continuing to operate between Limerick and Ennis, with a limited service for Sixmilebridge Station for the duration of the closure.
The line flooded following a significant increase in water levels at Ballycar Lough after heavy rainfall in December and January.
"While the intense rainfall ceased in January, inflows caused flood levels at Ballycar to peak in early March at 1.4 metres above the rail line", Irish Rail says.
"This has now fallen to 0.9 metres above the line, with 1.75 miles of track remaining flooded, and Iarnród Éireann forecast that unless further extreme weather arises, the line will reopen in the middle of May".
The company has released a video showing peak flood levels, and detailing the reasons the area is prone to such flooding: