BB 67453 and BB 67597 are pulling empty freight cars Saint-Chély-d'Apcher – Clermont-Ferrand and are crossing the Viaduct of Garabit. Architect of the viaduct is Gustave Eiffel, total length 565m (1,854 ft), longest span 165 m (541 ft), 124 m (407 ft) high, construction 1882 – 1884.