Staff were waiting at the train station. It was well organised. We left in a small mini-van from Killarney train station and stopped at various scenic places to take pictures. We had some time to wander around Killarney town before boarding the train back to Dublin, so it's totally worth it!
It was great. The guide waited at the train station, and in Belfast the coach was waiting. The guide and driver was great in his commentary, the route to Giant's Causeway is beautiful. All the stops along the route were scenic, and crossing the Carrick-a-Rede rope was indeed an experience. We also saw a bit of Belfast from the coach! Highly recommended!