The Giant's Causeway and Bushmills Railway is a narrow-gauge heritage line running the two miles between Bushmills village and the Giant's Causeway visitor centre, through farmland and along the edge of the coastal cliffs. The journey takes about 20 minutes each way and is a pleasant alternative to driving between the distillery and the Causeway — particularly if you have children, who find the small steam and diesel locomotives entertaining.
The railway operates on a seasonal schedule (roughly Easter to October), with more frequent services in peak summer months. Check the timetable before planning a visit — there can be significant gaps between services. The Bushmills station is a short walk from the distillery, making the combination of distillery tour and Causeway visit by train a natural half-day excursion.