Exactly. Saying "I got no idea" over and over again just doesn't feel right to me and I don't think its helpful to the passenger either.
I can't speak for other passengers but personally I would much rather have a staff member on the train making announcements to apologise for a delay and say that they are still waiting to find out what's going on than complete silence.
No, it doesn't actually tell me more about the overall situation but at least I know there is someone on the train doing their best and that there's a good chance that once there is some information it will be passed on.
To me that makes a difference.
Do you therefore believe that an announcement saying "I have no idea what's going on" is professional and good customer service ?
Well it doesn't have to be phrased quite that way.
But with more sensible wording, I do. There are good reasons why on train staff might not have full information in which case there's nothing wrong with saying so.
And if there
isn't a good reason, then the railway has failed to be professionsl and offer good customer service but trying to hide that by just leaving people on a delayed train without any kind of announcement does not, in my view, make up for that.