BLANCHE: What you are talking about is brutal desire – just – Desire! – the name of that rattle-trap streetcar that bangs through the Quarter, up one old narrow street and down another…
STELLA: Haven’t you ever ridden on that streetcar?
– Tennessee Williams
A Streetcar Named Desire, Scene 4. Blanche uses the streetcar as a metaphor to tell Stella that sheer brutal sexual desire is no basis for a marriage. Stella continues the metaphor by asking if Blanche has never given into that same desire.