Metrolink has grown in popularity, and there are a number of planned extensions of the system and new stations. Station parking capacity has also been strained.
Train frequency increases and SCORE On April 26, 2018, Metrolink was awarded $1.175 billion from the
California State Transportation Agency in order to dramatically increase train service along its existing lines and for the expansion of the Metrolink station in time for the
2028 Summer Olympics. These funds will be used to heavily increase frequency on Metrolink's lines, with half-hourly frequencies planned on most routes.
High speed rail interface During the initial years of operation of the
California High-Speed Rail between
Merced and
Burbank, projected to commence in 2022 (but since repeatedly delayed to 2033), passengers would use Metrolink for travel between
Burbank and
Los Angeles. An alternative plan would have track-sharing to
Union Station but this would require electrification for that portion of the line. Such an electrification would be similar to the
Caltrain Modernization Program, which also involves electrifying a rail line for eventual use by commuter and high-speed trains. This alternate plan would provide a "one-seat ride" at the start of service between the Central Valley and downtown, or even Orange County (via
Anaheim).
Burbank Junction speed improvement project On November 9, 2022, Metrolink broke ground on the Burbank Junction speed improvement project. The project will realign and replace the mainline track and siding between
Burbank Boulevard and
Magnolia Boulevard. The project will shorten trip lengths on the
Antelope Valley Line trains,
Ventura County Line trains,
Pacific Surfliner trains, and
Coast Starlight trains by one and a half minutes and will permit trains to operate with 30-minute headways in both directions, massively improving service frequencies along the corridors. The location of the tracks will be slightly realigned in order to accommodate a new pedestrian overcrossing. The project was delayed by almost one year, with the project initially scheduled to break ground in the winter of 2021 and was expected to be completed in the winter of 2022. The construction completion date was expected to be in 2023, but as of December 2025, Metrolink instead is communicating that the project will be done by summer 2028.
91/Perris Valley Line Placentia infill station A new Metrolink station in Placentia, which will serve the 91/Perris Valley Line's north Orange County passengers, has completed its final design phase, save for issues related to the parking needed to accompany the station. Construction on the $24 million Placentia station began in 2018, and was scheduled to open in 2024, but now is on hold pending further negotiations with
BNSF.
Expansion to Temecula and Hemet In 2008, lobbyists pushed for a rail line to
Temecula in southwestern Riverside County via the 91 Line's (now the
91/Perris Valley Line)
Riverside–La Sierra station. While this proposed line could follow the route of an abandoned freight line, it would require significant funding, as freight service ceased almost 30 years ago. Despite this, the Riverside County Transportation Commission's 2008 Commuter Rail Feasibility Study still lists this route as one possibility being considered. Expansion to
Hemet has also been discussed, with two stations planned.
Perris Valley Line Extension to Winchester In 2024, the Riverside County Transportation Committee's Traffic Relief Plan called to extend the Perris Valley line to Downtown Winchester
Expansion to the Palm Springs Area The cities of the
Palm Springs Area (
Palm Springs,
Cathedral City,
Palm Desert,
Indio, and
Coachella) have requested commuter rail service from Los Angeles and Orange County, but the Union Pacific Railroad opposes further passenger service on its tracks. Nonetheless, in 1999, the Coachella Valley Association of Governments was investigating the possibility of two daily round trips via the 91/Perris Valley line from Los Angeles's
Union Station through Fullerton and Riverside to stations in Palm Springs and Indio (with a possible stop near
Palm Desert), possibly through a partnership with
Amtrak. This extension would likewise require significant money for infrastructure improvements: at least $500 million, according to the California State Rail Plan of 2005. and RCTC has resolved to pursue establishing one. By 2020, plans for the
Coachella Valley–San Gorgonio Pass Rail Corridor Service had evolved to an Amtrak-operated service.
Extension to Kern County Expansion to
Kern County has been discussed in a 2012 Kern County Council of Governments report. The expansion proposed is to extend the Antelope Valley line from Lancaster to Rosamond, along the Rosamond Corridor to service
Edwards Air Force Base.
Service between the cities Ventura and Santa Clarita The
Santa Paula Branch Line was acquired by the Ventura County Transportation Commission in 1995. The railway, a former portion of the
Southern Pacific Coast Line, connects the city of
Ventura to Santa Clarita paralleling
California State Route 126. Sierra Northern Railway operates the services on the line. Plans exist to rehabilitate tracks for Metrolink service. A study from 1991 estimated a cost between $70 million to $90 million to rebuild the line.
Service to Santa Barbara County The Santa Barbara County Association of Governments (SBCAG) had announced plans for
Metrolink service to/from
Los Angeles Union Station to begin in Winter, 2026, starting with one daily trip in each direction, however the plans were scrapped in favor of an additional
Pacific Surfliner train.
Orange County maintenance facility As of December 1, 2022, the
Orange County Transportation Authority (OCTA) has laid a third track south of the
Interstate 5 overpass in
Irvine leading into the future site of the Orange County maintenance facility. The facility will serve as an additional site to service Metrolink and Amtrak trains on a parcel of land owned by the Orange County Transportation Authority just north of
Irvine station. The project will receive funding from California's SCORE Transit Intercity Rail Capital Program. The project also includes an extension to Ridge Valley, a road north of the parcel where the project will occur.
Orange County Line realignment OCTA officials are interested in moving the
LOSSAN corridor (Los Angeles-San Diego), which carries the
Orange County Line and the
Pacific Surfliner, from its current alignment inland to avoid service disruptions due to coastal erosion along the route.
San Bernardino Line Zero Emissions Multiple Unit Beginning in 2024,
Arrow will use at least one
hydrail unit, called a Zero Emissions Multiple Unit (ZEMU). Furthermore, the
San Bernardino County Transportation Authority (SBCTA) has expressed interest to expand usage of the ZEMU from
Arrow to the
San Bernardino Line, which would result in them operating all the way to
Los Angeles Union Station.
LA General Medical Center and Pico Rivera infill stations Los Angeles Metro has plans to add the current
LA General Medical Center station on the
El Monte Busway as an
infill station to the
San Bernardino Line. This would involve building a second track and center platform. The cost of this project is estimated between $51 million and $110 million. Currently, westbound Metrolink passengers must exit at the
Cal State LA station and take any of the westbound buses one stop to the Medical Center. LA Metro also has plans for an infill station serving
Pico Rivera, located on the
91/Perris Valley and
Orange County lines between and stations.
Pomona-North to Rancho Cucamonga Metrolink Shuttle Service SBCTA is planning to increase frequency from
Pomona North to the
Rancho Cucamonga Metrolink station to 15 minute frequency using
ZEMU. it is expected to cost 150 million. == Governance ==