The time zone in the United States that has the most railroad tracks in 1890 would be the Central timezone.
The Central timezone in the United States had the most railroad tracks in 1890. This is because the Central timezone was home to a majority of the country's major cities and industrial centers, which were the primary drivers of railroad development.
The Central timezone also included a large portion of the Midwest, which was a major agricultural region that relied on railroads to transport goods to market.
The region's fertile lands, abundant resources, and growing cities made it an ideal location for rail lines to transport agricultural goods, manufactured products, and passengers.