La Metro

The extension would fix the Green Line's issue of being a route that goes "from nowhere to nowhere." The MTA has also in the past listed on its list of possible projects an extension at the Green Line's eastern end, linking the Green Line to the Metrolink station in Norwalk, possibly with a short underground segment.

Crenshaw Corridor: This funded line has no color designation, but with the 2008 long range plan it is clear that this new line is of high priority. The southern terminus is yet to be determined, but there is strong support for it to veer southwest and end at LAX or the Aviation Station on the Green Line.

In any case, this line will either be a light rail transport running mainly on the streets like the Blue Line or in a bus transitway like the Orange Line.

Long Range Plans: In the 2008 LACMTA Long Range Plan, it designated the Strategic Unfunded section, outlining more possible future subway and LRT lines. and a two-pronged alignment extending from Hollywood and joining the Wilshire line in Beverly Hills.

The second tier of the Strategic Unfunded plan includes a Vermont Corridor Subway, the Silver Line, a BRT from NoHo to Pasadena, an LRT Yellow Line from NoHo to the regional connector and a Green Line extension from LAX to Santa Monica.

Citizen advocacy
Rail advocates have proposed the following lines:
The Silver Line is another light-rail proposal which would operate from El Monte to Hollywood, passing through the western San Gabriel Valley, University of Southern California Health Sciences Campus & Los Angeles County Hospital, Union Station, Downtown L.A., Echo Park, and Silver Lake along the way. It would use existing rail between El Monte and Union Station in downtown Los Angeles.

As of March 2008, the Silver Line has appeared on the LACMTA's Draft long range transportation plan which outlines future projects for the Los Angeles County region.