How can I travel to Ireland with my Select Pass?
Ireland is classed as a bordering country to the Benelux (Belgium, Netherlands and Luxembourg). France previously bordered with Ireland but no longer participates in the Eurail Select Pass. Your Eurail Select Pass entitles you to travel by discounted ferry between Ireland and France.
Here are your travel options to reach Ireland:
Buy point-to-point train tickets for train travel in France to the port in Cherbourg or in Roscoff. Irish Ferries offers a 30% discount on ferry crossings between those French ports and Rosslare (Ireland). Your pass only needs to be valid in Ireland.
Order a Eurail Global Pass instead. This best value pass allows you the freedom to travel by train in up to 24 countries and includes France. From France you can take a discounted-ferry (see above).
Another possibility is to fly to Dublin (Republic of Ireland) or Belfast (Northern Ireland) from one of the Benelux countries.