MERCURE CASTRES L OCCITAN. . To reach the Mercure Castres L'Occitan: By Car: D612, between the city center and the Siala business district, head toward Mazamet from the city center. By train: 1.2 mi (2 km) from the Castres SNCF train station. By plane: 3.1 mi (5 km) from Castres Maza met Airport, 50 mi (80 km) from Toulouse Blagnac Airport