I am aware of that thanks, and in fairness would have little reason to travel to Belfast unless essential as everything closed etc,

So in answer to my question - there are police checks on the train line?

I would expect Garda checks, but if, as you say, it is essential (medical appointment perhaps) and you have a confirmation letter on you you will be able to explain yourself,

Many thanks for your response- you don't use the line regularly so are assuming - thanks again for the input.

"as belfast is more than 5 kms from dublin, you cannot travel unless you have an essential reason for travel."

So the train nor aircoach is running unless it is a valid reason? Basically no tourism at all.