Bay Area Rapid Transit District
When the SFO/Millbrae extension opened on June 22, 2003, the Richmond–Daly City/Millbrae line continued to terminate at . BART extended this line to and during weekday peak hours on February 9, 2004. San Mateo County is not a member of the San Francisco Bay Area Rapid Transit District, so SamTrans funded the county's BART service. When the extension's lower-than-expected ridership caused SamTrans to accrue deficits, BART agreed to SamTrans' request to operate only the Dublin/Pleasanton line south of Daly City effective September 12, 2005.