The first transcontinental railroad increased?

The First Transcontinental Railroad was a 1,912-mile continuous railroad line constructed between 1863 and 1869 that connected the existing eastern U.S. rail network at Council Bluffs, Iowa with the Pacific coast at the Oakland Long Wharf on San Francisco Bay. The rail line was built by three private companies over public lands provided by extensive US land grants. Construction was financed by both state and US government subsidy bonds as well as by company issued mortgage bonds. The Western Pacific Railroad Company built 132 mi of track from the road's western terminus at Alameda/Oakland to Sacramento, California. The Central Pacific Railroad Company of California constructed 690 mi eastward from Sacramento to Promontory Summit, Utah Territory. The Union Pacific Railroad built 1,085 mi from the road's eastern terminus at the Missouri River settlements of Council Bluffs and Omaha, Nebraska westward to Promontory Summit.

Explanation:

the answer is option a.