Arrow is a hybrid rail (light rail with some features similar to commuter rail) line in San Bernardino County, California, United States. Opened on October 24, 2022, the line runs from the San Bernardino Transit Center in Downtown San Bernardino in the west to the University of Redlands in Redlands in the east. The line was planned and constructed by the San Bernardino County Transportation Authority as the Redlands Passenger Rail Project and is operated under contract by Metrolink, which integrates Arrow into its commuter rail system.