sold the line to local transportation authorities in 1992, with ownership split between the Southern California Regional Rail Authority in Orange County and the San Diego Northern Railway in San Diego County. Operations Commuter trains began operating in the 1990s, initially as an outgrowth of existing Amtrak services before assuming the identities of Metrolink and Coaster. Coaster runs within San Diego County, between San Diego and Oceanside, while Metrolink's services operate north of Oceanside. Amtrak's Pacific Surfliner travels throughout the corridor. The San Diego Trolley light rail shares the Surf Line's right of way in San Diego, running adjacent to the heavy rail tracks. For about a mile in Oceanside, the Sprinter service parallels the Surf Line before heading east on the Escondido Subdivision towards Escondido, California. Freight traffic includes military vehicles and equipment to Camp Pendleton and the Navy ports in San Diego. Due to passenger trains running on a daily schedule, occasional BNSF manifest freight trains run through the Surf Line often at night, which is dubbed as the "Daygo". About two-thirds of the segment from the Orange County line to the Santa Fe Depot in downtown San Diego has been double-tracked. As one of the nation's busiest corridors, local transportation and planning agencies want to complete the entire section. A section of double track between Elvira (SR 52) and Morena (Balboa Avenue) was completed in July 2020. The $192 million project, which began in August 2015, completed of double track from San Diego northward. The segment of the LOSSAN Corridor within San Diego County achieved full implementation of positive train control in December of 2018, for all passenger and freight trains operating on this segment. Track issues Due to its location along the beaches of Southern California, the line faces persistent issues due to sea level rise and coastal erosion, exacerbated by climate change. The tracks are adjacent to coastal bluffs some above the beach for in Del Mar. Coastal erosion eats away at the bluff each year and the rate has accelerated due to sea level rise due to climate change. The bluff has had to be shored up to safely run current operations. Steel beams were driven into the beach at the base of the bluff in September 2020 to stabilize the face of the bluff for 20 or 30 years. In August, the California Coastal Commission had emphasized the need to move the railroad