continue to operate along with the newer Siemens Charger SC-44 locomotives, which entered service in 2020. See also List of San Francisco Bay Area trains References External links Official Altamont Corridor Express website ACEforward projects San Joaquin Regional Rail Commission website California railroads Passenger rail transportation in California Public transportation in the San Francisco Bay Area Public transportation in the San Joaquin Valley Area Public transportation in Alameda County, California Public transportation in San Joaquin County, California Public transportation in Santa Clara County, California Transportation in San Jose, California Diablo Range Fremont, California Livermore, California Pleasanton, California Santa Clara, California Stockton, California Tracy, California Standard gauge railways in the United States Commuter rail in the United States Railway lines opened in 1998 1998 establishments in California 2023 in rail transport