[6]: 1 The service area covers 1,120 sq mi (2,900 km2), bounded approximately by the San Gorgonio Pass on the west and the Salton Sea on the southeast.

West Drive, Pierson Boulevard Cook Street, University Park Drive Calle Madrid & Avenida Vallejo Harris Lane, Washington Street Calle Madrid, Avenida Vallejo Highway 111, Golf Center Parkway Shadow Hills High School Shadow Hills High School Avenue 44, Jefferson Street Destinations served include:[10] SunLine is governed by a board of directors with 10 members[11] Chair Nancy Ross Vice Chair Lynn Mallotto Chief Executive Officer Mona Babauta The initial fleet included 22 buses in 1977.

[12]: 11 The SunLine Board of Directors adopted a resolution in 1992 to convert their fleet to alternative fuel, and became the first transit agency in the United States to do so in 1994, using compressed natural gas (CNG) buses.

[13] The first revenue operations were conducted with the Thor/ISE ThunderPower fuel cell bus, using an ElDorado National EZ-Rider II chassis, between November 2002 to February 2003.

[17]: 1, 3  Due to the relatively long fixed routes, the final mix of ZEBs is expected to be mostly hydrogen fuel-cell buses.