If you are asking about the US, then it ended at the Pacific ocean or in the Gulf of Mexico.
It connected the existing rail network that was already there on the east and west coasts. It did not have an end as such.
a rail road that went from one end of america to another
Utah
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Sacrament and Utah
Transcontinental Railroad
devin matthew murray
The western starting point for the first transcontinental rail road was at Sacramento, California.
Kent County Rail Road ended in 1883.
Lake Lock Rail Road ended in 1836.
The early invention improved the transcontinental transportation of the people and goods was the steam locomotive. This was facilitated by the rail road network that was developed.
Long Island Rail Road North Shore Branch ended in 1921.
The Central Pacific and the Union Pacific Railroads.