We will be traveling by train from Dublin to Ashford Castle. Can you tell me how to do this?

Ashford Castle is close to Cong. In checking the Ireland train routes the train does not go to Cong. There is a bus from Galway to Cong. You may need to check train times Dublin to Galway and bus times to Cong.

If the Ashford Castle does not pick up at the bus station you may have to have a taxi to get to the csstle.

You could email AShford Castle as they must know the best method of transportation Dublin to the castle.

I agree - contact the hotel. It is nearly 20 miles from Galway Station and I personally wouldn't think their guests would particularly expect/appreciate a 20 mile bus ride to stay at a posh place like that.