Southern Pacific Transportation Company Tags: Public Transit System.The Southern Pacific Transportation Company (reporting mark SP) earlier Southern Pacific Railroad and Southern Pacific Company and usually called the Southern Pacific or (from the railroad’s initials) Espee was an American Class I railroad. thumbnail closing year 1996-01-01T00:00:00+02:00 headquarter San Francisco location Arkansas, California, Colorado, Illinois, Kansas, Louisiana, Missouri, Nevada, New Mexico, Oklahoma, Tennessee, Texas, Utah, Arizona, Oregon opening year 1865-01-01T00:00:00+02:00 reporting mark SP Learn more... Loading...