West Santa Ana Branch
The West Santa Ana Branch is a former streetcar right-of-way (ROW) and potential transit corridor connecting Los Angeles County and Orange County in Southern California. The Los Angeles County Metropolitan Transportation Authority (Metro) owns the part of the ROW in Los Angeles County, and the Orange County Transportation Authority (OCTA) owns the part of the ROW in Orange County. 
The streetcar right-of-way was operated by the Pacific Electric Railway. The ROW runs from the Watts Towers in the city of Los Angeles, southeast to 4th Street / Santa Ana Boulevard in downtown Santa Ana. A two mile portion of it is occupied by the I-105 and the Metro Green Line. The ROW runs dead-straight for nearly 20-miles on a diagonal between these two cities, in stark contrast to the cardinal grid of Orange County. As such, the route is clearly visible from aerial photographs from high altitude.
The project is being considered as a way to relieve freeway congestion between the two counties. Metro has prioritized the corridor on its Long Range Transportation Plan (LRTP), and funding for it is guaranteed in Measure R. The project is being coordinated by the Southern California Association of Governments (SCAG) in conjunction with Metro and OCTA.
SCAG is conducting an alternatives analysis to determine the list of all feasible alternatives for the project. These alternatives may use all or part of the ROW. Modes under consideration are bus rapid transit, light rail, commuter rail and high-speed rail. SCAG organized a first round of public meetings in June 2010. A second round of public meetings were held in November and December 2010.
As of 2015, the Orange County Transportation Authority (OCTA) is collaborating with the cities of Santa Ana and Garden Grove to construct a 4-mile, $250 million light rail line between the two cities. The western terminus of the proposed route would follow the Pacific Electric right-of-way near the intersection of Harbor Boulevard and Westminster Avenue in Garden Grove, then along Santa Ana Boulevard into Downtown Santa Ana, where it would reach the Santa Ana Regional Transportation Center at its eastern terminus. The project is expected to open in 2020.
- "West Santa Ana Transit Corridor". Los Angeles Metro. Retrieved 2014-01-01.
- "Pacific Electric Right of Way Study". Orange County Transportation Authority. Retrieved 2014-01-01.
- "2009 Long Range Transportation Plan Attachment A" (pdf). Los Angeles County Metropolitan Transportation Authority. Retrieved 6 January 2014.
- "Proposed One-Half Cent Sales Tax for Transportation" (pdf). Los Angeles County Metropolitan Transportation Authority. Retrieved 6 January 2014.
- "About the Project". Pacific Electric Corridor. Southern California Association of Governments. Archived from the original on 1 May 2012. Retrieved 6 January 2014.
- Chan, Steven (2008-09-05). "Bravo! rapid bus, part III: A massive expansion, plus light rail in Orange County?". Resonance:Steven Chan's website. Retrieved 2014-01-01.
- "Community Meetings". Pacific Electric Corridor. Southern California Association of Governments. Archived from the original on 3 May 2012. Retrieved 6 January 2014.
- "OC Streetcar rolls ahead with designer chosen". OCTA.com. Orange County Transit Authority. 2015. Retrieved 2015-11-03.