The Surf Line is a railroad line that runs from San Diego north to Orange County along California's Pacific Coast. It was so named because much of the line is near the Pacific Ocean, within less than in some places. The tracks are now owned by the Southern California Regional Rail Authority and the North County Transit District, and hosts Metrolink's Orange County Line and Inland Empire–Orange County Line, the San Diego Coaster, and Amtrak Pacific Surfliner passenger trains. The BNSF Railway operates freight over the line using trackage rights. History Construction of the Surf Line between Los Angeles and San Diego began on October 12, 1880, with the organization of the California Southern Railroad Company. On January 2, 1882, the California Southern commenced passenger and freight service between National City and Fallbrook Junction, just north of Oceanside. From Oceanside the line turned northeast for a winding route through the Temecula Canyon, and was finished on August 21, 1882. The line became part of the Atchison, Topeka and Santa Fe Railroad's transcontinental rail line in 1885 via an extension of the California Southern from Colton north over the Cajon Pass to Barstow. From 1886 to 1888, the Riverside, Santa Ana and Los Angeles Railway built a branch from Highgrove southwest via Riverside to Santa Ana and from Orange (just north of Santa Ana) northwest to Los Angeles. Also in 1888 the San Bernardino and San Diego Railway completed its line from Oceanside north to Santa Ana, completing what was originally called the Los Angeles–San Diego Short Line. The now-downgraded old route was destroyed by floods in 1891 and the new line, later named the Surf Line, was now the only line to San Diego from the north. In 1910, the Fullerton and Richfield Railway built a short cutoff of the San Bernardino–Los Angeles route from Atwood west to Fullerton, giving the Surf Line its northern terminus of Fullerton. For much of the 20th century, the Surf Line (officially, the Fourth District of the Los Angeles Division) was to the Santa Fe what the New York City–Philadelphia corridor was to the Pennsylvania Railroad. Daily traffic could reach a density of ten trains (each way) during the summer months. The route hosted AT&SF San Diegan passenger trains, renamed the Pacific Surfliner by Amtrak in 2000. The Santa Fe installed centralized traffic control in 1943–1944 which increased capacity on the line. Santa Fe