Tiana catches trolley A113 on her way to another job.
A1-13 refers to a specific classroom at CalArts. Recognized as one of the best animation schools in the world, the majority of Disney & Pixar animators have spent time in CalArts classroom A1-13 for character animation and design.
In 1961 Walt and Roy Disney founded the California Institute of the Arts, commonly know as CalArts. The Disneys created CalArts by combining two established schools, the Los Angeles Conservatory of Music (founded 1883) and the Chouinard Art Institute (founded 1921).
Image © Walt Disney Animation