Metro Los Angeles is changing from a colors to alphabet letters when naming its rail lines and busways. once the Regional Connector project goes online Downtown. Soon we won’t just “Take the A Train:” to Harlem in Manhattan. We will take it when we are “thinking of heading uptown” from Long Beach to downtown L.A.
So I am assuming it will be the “C” train extended north to West Hollywood and Hollywood eventually. Of course, letters may change or be added and alignment grow and new operational routes become possible. Here is a look at the system — in progress.