What were some of the benefits of the transcontinental railroad? what were the human costs of its construction? what groups of people built the railroad?

Some of the benefits of the Transcontinental Railroad was that new land was discovered, trade can expand to the west and people don't have to risk their lives to go to the west. Some of the groups of people that build the railroad were immigrants manly Chinese, Irish, Africans, and Latinos.  

Their solution was to tax the colonists.