For those who are unaware (like I was until I moved back in June), LA Metro has renamed all of its train lines. Per
wikipedia:
A Line (opened 1990 as Blue Line) is a light rail line running between Downtown Los Angeles and Downtown Long Beach.
B Line (opened 1993 as Red Line) is a subway line running between Downtown Los Angeles and North Hollywood.
C Line (opened 1995 as Green Line) is a light rail line running between Redondo Beach and Norwalk, largely in the median of the 105 Freeway.
D Line (opened 2006 as Red Line, then changed to Purple Line) is a subway line running between Downtown Los Angeles and the Mid-Wilshire district of Los Angeles.
E Line (opened 2012 as Expo Line) is a light rail line running between Downtown Los Angeles and Santa Monica.
L Line (opened 2003 as Gold Line) is a light rail line running between East Los Angeles and Azusa via Downtown Los Angeles.