In Martinez, transportation options include WestCAT, which provides service to the El Cerrito del Norte BART station, and the County Connection, the primary local bus operator with destinations to Concord, Pleasant Hill, and Walnut Creek BART stations. Tri Delta Transit also offers express service between Martinez and eastern Contra Costa County. State Route 4 runs through the city, connecting westward to Hercules and eastward to Stockton and the Sierra Nevada. Interstate 680 passes through Martinez via the Benicia-Martinez Bridge, connecting to Sacramento and San Jose. Additionally, Amtrak provides passenger rail services through Martinez, including the California Zephyr, Coast Starlight, Capitol Corridor, and San Joaquin trains, offering connections to various destinations in California, Nevada, and Oregon. The city also has plans for a potential BART line extension in the future. The Muir Trestle, also known as the Alhambra Trestle, carries freight operations of the BNSF Railway through Martinez alongside California State Route 4.