Henry E. Huntington, nephew and protégé of Southern Pacific Railroad magnate Collis Huntington, decided to invest his fortune in developing interurban railroads serving the Los Angeles Basin, beginning in 1898 and working through 1920. With enough capital to put railroads where he felt they would work best, he exerted considerable influence on the early growth of Southern California. He also invested in a number of other regional industries, and as an avid collector of rare books and art, he and his second wife Arabella created a notable cultural legacy as well.

This railroad series chronicles the World's Largest Interurban Electric Systems, developed by Henry Huntington, throughout Southern California.

Of the rail lines created at the turn of the 20th century, in order to build interurban links through Southern California communities around metropolitan Los Angeles, the Pacific Electric grew to be the most prominent of all. The Pacific Electric Railway is synonymous with Henry Edwards Huntington, the capitalist with many decades of railroad experience, who formed the "P. E." and expanded it as principal owner for nearly its first decade. Huntington sold his PE holdings to the giant Southern Pacific Railroad in 1910, and the following year the SP absorbed nearly every electric line in the fourcounty area around Los Angeles in the "Great Merger" into a "new" Pacific Electric. Founded in 1901 and terminated in 1965, Pacific Electric was known as the "World's Great Interurban."