Yup, the Red and Purple lines are the only (current) commuter rail systems that are underground or subways in LA. Red runs from Union Station to North Hollywood and the Purple runs from Union Station to Wiltshire (Western).
I brought it up HERE during the discussion for 40 2/3 in reference to Grognaurd's question of where did "they" go.
However, what about the fictional WA LA? There is already a planned real expansion of the Purple line to go out to Westwood (VA Hospital).
There are quite a few others too.
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