Cal State San Marcos station is an elevated railway station in San Marcos, California, the only such station along the North County Transit District's SPRINTER hybrid rail line. The station sits on a loop of the San Diego Northern Railway's Escondido Subdivision that crosses over State Route 78 to serve the California State University, San Marcos campus, which is located southwest of the station. On campus days, shuttle services are available to ferry students from the train station to the heart of the CSUSM campus and vice versa.