Respuesta :

I would say 30,000 cause all the next developments were from the 1860's forward and that is when huge growth happened, after 1860.
Martebi

The number of miles of railroad tracks throughout the United States had risen to  30,000.

How many miles of railroads were there in the US in 1860?

The number of miles of railroad tracks throughout the United States was said t be about 30,000 miles.

By the year 1860, about 30,000 miles that is 49,000 km of railroad tracks is said to have been laid. Baltimore and Ohio railroad was known to be one of the first chartered railroad in the United States.

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