6014766 Linking of the Union and Central Pacific Railroads to complete America\'s first transcontinental railway line, Promontory Summit, Utah, 1869 (b/w photo) by American Photographer (19th century) (after); Private Collection; (add.info.: Linking of the Union and Central Pacific Railroads to complete America\'s first transcontinental railway line, Promontory Summit, Utah, 1869. Illustration from Railway Wonders of the World (The Amalgamated Press Limited, London, c1937).); by Look and Learn.