Helped build the first transcontinental railroad

Question

Who made the transcontinental Railroad

Answer 1

If you are asking which railroad (RR) companies built the US transcontinental railroad, they are the Central Pacific RR, laying track from the west toward the east, and the Union Pacific RR, laying track from the east toward the west.  They started before the Civil War, and finished a few years after the end of the war, meeting at Promontory, Utah, connecting the 2 lines of track.

Answer 2

Many were Chinese--cheap imported labor.