USA HISTORY

Detailed explanation-1: -The eastward route took the rails through the Sierra Nevada Mountains. Workers from both companies dangled from rocky slopes, hacking holes and placing explosives. The workers also faced attacks from Native American tribes who lived on lands that were being gobbled up by the tracks.

Detailed explanation-2: -The Central Pacific met its greatest challenge at the outset-the towering Sierra Nevada, which presented enormous engineering obstacles and strangling winter snows. Deep fills, rock cuts, high trestles, snaking grades, and 15 tunnels through 6, 213 feet of solid granite blooded the CP crews.

Detailed explanation-3: -What obstacle was faced by both central Pacific and Union Pacific workers? If you go by the answer, the correct answer is The hard weather conditions. Such conditions make the workers feel uncomfortable while working and this effects on their work efficiency.

Detailed explanation-4: -In the Sierra Nevada range, track raised on trestles hugged steep cliffs, making it possible to build a railroad through the mountainous Donner Pass. Trestles, one of which was eleven hundred feet long, hugged the precipitous sides of Cape Horn.

Detailed explanation-5: -Winter weather was the CP’s greatest, most underestimated problem. During the winter of 1866, it took nearly half the CP work force of 9, 000 men just to keep the track shoveled.