The three serious challenges for the railroad companies building the transcontinental railroad were:
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Finding enough workers to do the most dangerous tasks - Labor was a significant issue, and finding skilled and unskilled workers willing to take on the dangerous work was challenging.
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Facing snowstorms and harsh weather - The construction crews had to deal with severe weather conditions, including snowstorms, which posed risks and complications.
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Crossing mountain ranges - The physical geography presented significant challenges, particularly when crossing the rugged terrain of the Rocky Mountains and Sierra Nevada.
These factors created substantial obstacles that railroad companies had to overcome during the construction of the transcontinental railroad.