Labor, geography, climate were the main problems. Much of the railroad had to be built in inhospitable climates with little or no infrastructure to support the massive worker populations.
This led to high mortality rates.
Utah
9945030
Sacrament and Utah
The western starting point for the first transcontinental rail road was at Sacramento, California.
Transcontinental Railroad
devin matthew murray
a rail road that went from one end of america to another
the invention of refrigerated rail cars.
If you are asking about the US, then it ended at the Pacific ocean or in the Gulf of Mexico.
Union Pacific Railroad
During which decade did transcontinental rail service begin in the United States?
the Union Pacific and Central Pacific