Blanche's trip is described as taking "a streetcar named Desire, and then transfer to one called Cemeteries and ride six blocks and get off at-Elysian Fields." This foreshadows the progression of the play. What do the three symbolize?

Based on the scenario being described within the question it can be said that these three places or "scenes" are symbolizing that her life was spent following all of her different desires which ultimately lead to her destruction (cemetery is a metaphor for death) and concludes her ending in Elysian Field, leading to what happened in this final scene.