The Coaster is a commuter rail system that serves the coastal communities of San Diego County, California. The system is operated by the North County Transit District (NCTD) and began service in 1995. The Coaster provides service between Oceanside and downtown San Diego, with stops in several cities along the way, such as Encinitas, Solana Beach, Sorrento Valley, and Old Town San Diego. The Coaster operates Monday through Friday, with limited service on weekends and holidays.