Rail roads 1865 & parallelism

If you traveled back to 1865 when railroads were being built all across the American frontier what strategies could you teach the railroad workers about patellelism so they could always built tracks the right width apart?

Do you think it would be practical to use principles of parallelism for building railroads during that time period? Why or why not?

what other methods could be used to ensure parallel rails (any method not just the geometry kindsĀ 

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