Pacific Sun Railway is a short line railroad in San Diego County, California that works on the Escondido Sub, the Miramar Branch, and in Stuart Mesa Yard. It is based from Stuart Mesa Yard. It is owned by Watco Companies.
Pacific Sun started on October 24, 2008 after being contracted by BNSF Railway. BNSF previously provided service to the railroad's locale trackage.
Pacific Sun Railway runs short freight trains, or "locals", weekdays late at night along the Esondido line to Escondido and the Miramar line to Miramar.
Pacific Sun owns four locomotives. Two GP35 units originally owned by Seaboard Air Line, and two GP40 units originally owned by Western Pacific Railroad.