On Monday the TSSA called for the suspension of Network Rail HR boss Peter Bennett, over allegations he had "presided over a culture of fear and bullying" at the organisation.
Bennett is the only HR director currently serving on the Acas council, which decides the priorities and policies of the organisation. And a spokeswoman from Acas told HR magazine: "We are unable to comment on operations at Network Rail. However, Acas has experienced Peter Bennett to be a committed and conscientious Acas council member since May 2007."
The council also includes members from the TUC, Small Business Council, Confederation of British Industry and Unite.
EXCLUSIVE: Acas voices confidence in Network Rail HR boss as a conscientious Acas council member
Acas has declared its confidence in Network Rail's HR director, following calls from trade union TSSA for him to be suspended from his position.