Across from the main train station in Saint-Étienne.
From Lyon: Take the “Centre-ville” exit and follow signs for the Châteaucreux train station. From Clermont-Ferrand: Take the “Boulevard Thiers” exit, then follow signs for Ibis Gare TGV. From Le Puy, follow signs for Lyon, take the “Centre-ville” exit, then follow signs for Châteaucreux TGV Station.