Getting There & Away
Public transport reaches notable towns Thiers, La Chaise-Dieu and Ambert, though there's scant reliable or frequent transport elsewhere. From Clermont-Ferrand, trains connect to Thiers (€9.60, 45 minutes, up to nine daily) and SNCF bus-train combos link to Ambert (€15.40, 2½–3¾ hours, three daily). From Le Puy-en-Velay, SNCF buses trundle to La Chaise-Dieu (€9.80, one hour, weekdays only).
In spring and summer, an enjoyable (if infrequent) tourist train runs through the park from Courpière (15km south of Thiers) via Ambert to La Chaise-Dieu. Check the website for days of operation and buy tickets at the train station at which you're embarking.