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James Jerome Hill, was a Canadian-American railroad executive. He was the chief executive officer of a family of lines headed by the Great Northern Railway . which served a substantial area.Which also got very popular. https://en.wikipedia.org/wiki/James_J._Hill

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Jason also known as "Jay" Gould was a leading American railroad.He  developed and speculator. He has been portrayed as one of the ruthless robber barons of the Gilded Age. whose success at business made him one of the richest men of his era.https://www.google.com/search?safe=strict&rlz=1C1GGRV_enUS758US758&ei=bHj7WfmvFsHQjwOrw6jYDA&q=Jay+Gould&oq=Jay+Gould&gs_l=psy-ab.3..0l10.27546.31248.0.33055.3.3.0.0.0.0.90.90.1.3.0....0...1.1j2.64.psy-ab..0.1.85.0...60.3erGD4fzB6s

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Jay Cooke was an American financier.He helped finance the Union war effort during the American Civil War. he also did  the postwar development of railroads in the northwestern United States. He help alot with money https://en.wikipedia.org/wiki/Jay_Cooke

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He was alive for July 13, 1864 – April 15, 1912. he was an American businessman. He was also real estate builder. he started to be a investor, inventor. Then he started to  write and he became really popular.https://en.wikipedia.org/wiki/John_Jacob_Astor_IV

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Charles Croker made the Charles Crocker was an American railroad executive. He founded the Central Pacific Railroad. he also  constructed the westernmost portion of the railroad, and took over with the help of the Southern Pacific Railroad.https://en.wikipedia.org/wiki/Charles_Crocker