Symbolism in A Streetcar named Desire

In A Streetcar named Desire Tennessee Williams uses many images and symbols, in order to explain different themes, or to accentuate the moods of his characters, or to foreshadow something that is going to happen in the play.
I am going to tell you about several different levels at which he uses symbols:
• in the names of places and characters
• in the characters themselves
• in the music
• in the dialogue

Names of places and characters
Desire & Cemetery
When passing through New Orleans, Tennessee Williams (author of this 1947 play) saw two streetcars go by, one called "Desire", the other named "Cemetery". He believed ever since that they were two symbols of life, that on one hand we have dreams, ambitions, hopes and therefore "desire", and that after that comes death, a synonym of "cemetery". He transcribes his belief into A Streetcar named Desire by making these words two themes of the play.
Also, when Blanche first arrives in New Orleans, she says "They told me to take a streetcar named Desire, and then transfer to one called Cemetery" which could represent her crave to find stability and to create for herself a better life when moving to this new city. But this journey leads her to a dark end, a mental asylum, sadly quite close to a cemetery.
Elysian Fields
Elysian Fields is the street that Stella and Stanley live on. In Greek mythology it is the place where heroes went after death. They had the choice to return to Earth any time they liked but they rarely did, because of the pleasure they found in the Elysian Fields.
It is possible that Williams used this imagery to reflect Stella's life in Elysian Fields: she has become used to living in this place that has become her kind of paradise, and she doesn't wish to return to her past life.
Another explanation for Williams' choice of this particular name could be an ironical comparison of this peaceful and calm place in Greek mythology with Stanley, Stella,