The National Bus and Rail Workers Union is seeking clarity from Bus Eireann, after several bus drivers in Cork had their wages docked last month.
A number of drivers chose not to report for work on the grounds of health and safety, after Met Eireann issued a Red Alert for rain ahead of Storm Bert.
Bus Eireann says the safety of its staff is of "paramount importance," and they cancelled a number of West Cork services due to the weather warning.
However drivers who failed to turn up for work on other routes were issued with formal warnings and their wages were docked
Dermot O'Leary of the NBRU, says the union is trying to understand Bus Eireann's decision making process in the matter:
"Our role is that when things fall down, is to make sure our drivers are represented." Mr O'Leary said.
"Firstly we want to get their pay restored, and for us to gain an understanding from Bus Eireann and how they make those kinds of decisions around red alert warnings.
"This is the first time I have seen a public transport company deciding to run services during a red warning and we want to understand that."
