Two rail companies started on each side of the country and they built toward each other. One started in Sacramento, CA and the other started in Omaha, NE.
Ran from San Jose, CA, to Sacramento, CA to connect the cities with the Transcontinental Railroad
Los Angeless, CA, to New Orleans, LA. http://www-tc.pbs.org/wgbh/americanexperience/media/uploads/rails_tales_sprr.jpg
Finished in 1883. It stretched from Lake Superior to Portland, OR. http://www.memoriallibrary.com/Trans/RRGaz/NP/northernpacific.jpg
Stretched from Atchinson, KS, to Los Angeles, CA.
It ran from St. Paul, MN, to Seattle, WA.