The company was chartered on December 14, 1906, and groundbreaking ceremonies held at the intersection of San Diego's Main and 26th Streets on September 7, 1907. Construction delays, attacks by
Mexican revolutionaries, and government intervention during
World War I all served to push the construction completion to November 15, 1919 when the "golden spike" was finally driven by John Spreckels. In 1917, the SD&A acquired the San Diego and Southeastern Railway, which operated branches to
Foster (formerly the San Diego, Cuyamaca, and Eastern Railroad) and
Bonita (formerly the National City & Otay Railway). The first through SD&A
passenger train left Campo on the morning of November 30, and made the full run from El Centro to San Diego's downtown union station,
Santa Fe Depot, for the official opening of the line on December 1, 1919. The total construction cost of the of track laid was approximately $18 million, or some $123,000 per mile; the original estimate was $6 million. The long segment through
Carrizo Gorge (which included of tunnels, 17 in all) alone cost over $4 million to construct; the three miles (5 km) of tunnels (21 total) along the entire line ran another $1.8 million. Almost of bridges and trestles were built as well. The tracks departed downtown San Diego south where they crossed the
U.S.-Mexico border at
San Ysidro. From there the line traversed eastward through
Tijuana, then headed northeast through
Tecate and back over the border to the town of
Campo. To construct and maintain the 44-mile (72 kilometer) stretch through
Mexico the
SD&A formed the
Ferrocarril Tijuana y Tecate, S.A. de C.V., at the behest of the Mexican government. East of Campo the road traveled through Clover Flats, across the Coast Range (elevation 3,660 feet), then descended through the breathtaking but treacherous
Carrizo Gorge, the builders' most significant obstacle. Though the SD&A line ended in
Seeley, trackage rights gave the railroad the ability to run trains as far east as El Centro and as far south as
Calexico. Branch lines ran from downtown to as far north and east as the community of
Lakeside, with a separate line which rounded San Diego Bay to service
Coronado Heights,
Coronado, and North Island. Damage to the lines from heavy rainstorms, landslides, and fires took a financial toll on the railroad, as did border closings with Mexico. Clashes with the
Industrial Workers of the World resulted in acts of vandalism as well. In 1932, financial difficulties forced Spreckels' heirs to sell their interests in the firm for $2.8 million to the Southern Pacific, which renamed the railroad the
San Diego and Arizona Eastern Railway (SD&AE). In 2012 the Mexican government allowed the company Baja Rail to restore and use the track between Tijuana and Tecate. The company has poured ~$20,000,000 into revitalizing the 44 mile stretch of track it is allowed to operate on. The company sought approval from the United States government to build and restore the desert line of the track in San Diego, to allow some more commerce between the two countries. The
San Diego Metropolitan Transit System (MTS) stepped in, and Baja Rail partnered with them to restore the track. However, they made little progress and suddenly stopped making payments to MTS in 2020. The fate of the railway's operation is unclear, as of 2025. ==Timeline==