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In page First transcontinental railroad:

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The Union Pacific Railroad did not start construction for another 18 months until July 1865. They were delayed by difficulties obtaining financial backing and the unavailability of workers and materials due to the Civil War. Their start point in the new city of Omaha, Nebraska, was not yet connected via railroad to Council Bluffs, Iowa. Equipment needed to begin work was initially delivered to Omaha and Council Bluffs by paddle steamers on the Missouri River. The Union Pacific was so slow in beginning construction during 1865 that they sold two of the four steam locomotives they had purchased.[citation needed]