Answer:On May 10, 1869, at Promontory Summit, Utah, a golden spike was hammered into the final tie. The transcontinental railroad was built in six years almost entirely by hand. Workers drove spikes into mountains, filled the holes with black powder, and blasted through the rock inch by inch.
Explanation:Handcarts moved the drift from cuts to fills. Bridges, including one 700 feet long and 126 feet in the air, had to be constructed to ford streams. Thousands of workers, including Irish and German immigrants, former Union and Confederate soldiers, freed slaves, and especially Chinese immigrants played a part in the construction. Chinese laborers first went to work for the Central Pacific as it began crossing California's Sierra Nevada Mountains in 1865.
I hope this helps, Sunset