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Building the pacific railway the construction story of americas first iron thoroughfare between the missouri river and california from the inception of the great idea to the day may 10 1869 when the union pacific and the central pacific joined tracks at promotory point utah to form the nations transcontinental. Building the pacific railway the construction story of americas first iron thoroughfare between the missouri river and california from the inception of the great idea to the day may 10 1869. Building the pacific railway the construction story of americas first iron thoroughfare between the missouri river and california from the inception of the great idea to the day may 10 1869 when the union pacific and the central pacific joined tracks at promontory point utah to form the nations transcontinental. Building the pacific railway the construction story of americas first iron thoroughfare item preview. Building the pacific railway the construction story of americas first iron thoroughfare between the missouri river and california from the inception of the great idea to the day may 10 1869 when the union pacific and the central pacific joined tracks at promotory point utah to form the nations transcontinental