Symbolism in Sylvain Chomet's The Triplets of Belleville (2003)

What role does the various symbolism play in the animated film, The Triplets of Belleville, and how does it contribute to the themes presented? The Oscar nominated film is mostly silent, relying on the images within the story to have an impact on the viewer. What impact, if any, do the reoccurring symbols have? For example: trains, wine, the statue of liberty, etc.