Question

What hardship did both Central Pacific and Union Pacific workers face?

attacks from American Indians
blasting through the Sierra Nevada
extreme weather conditions
losing workers to the gold rush

Answer 1

The third option is correct – Extreme weather conditions.

The Central Pacific Railroad was a cargo and passenger train company that had operations between California and Utah in the 1860s.  

The Union Pacific Railroad is a similar company set up in 1862, that has country wide operations covering Chicago, Illinois to the Pacific coast. The Central Pacific Railroad, later on became part of the Union Pacific Railroad company.

Answer 2

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.

So measures should be taken to avoid such conditions.