We were thinking about taking the train in La Coruna to Santiago de Compostela. It appears very much a possibility. Rail Europe https://www.raileurope.com/en-us/destinations/a-coruna-santiago-de-compostela-train has direct trains between the cities for about 15 Euros. The train runs about every 30 to 45 minutes throughout the day. Tickets can be purchased online and popular times sell out. The transit station in La Coruna is located at Av. Ferrocarril, 2, 15007 A Coruña, Spain.