Don't you know?
CIE think we still hibernate on christmas day around a log fire with micky playin a fiddle. We spend the next day trying to get the fiddle out of micky's....eh......fiddle case. Of course on Christmas eve, we must be home by 9pm or we all turn into pumpkins.
But remember to take this into account, the Luas doesn't operate on xmas day either. So obviously the forward thinking non CIE company that is Connex

haven't looked at this yet. However our local PD activist didn't mention the luas, did he?
Our xmas tradition is cultural, not operational. Change the culture and the operation will change for you.
I really hope it doesn't take 50 years for us to "have a go" at Connex.