S6 / Alco / PhotosFerrocarril del Pacifico Alco S6 702Ferrocarril del Pacifico Alco S6 702 in a builder photo at Schenectady, New York, June, 1955. Photographer: Alco
S6 / Alco / PhotosFerrocarriles Unidos de Yucatan Alco S6 301Ferrocarril Unidos de Yucatan Alco S6 301 in a builder photo at Schenectady, New York, November, 1960. Photographer: Alco