* "The Princess and the Frog" (2009) features a scene where Tiana's father works on a plantation and expresses the desire for his children to have a better life.
* "Soul" (2020), while not directly about the Underground Railroad, addresses themes of societal expectations and the pursuit of one's true calling, which can be seen as relevant to the experiences of those seeking freedom.
While Disney hasn't focused on the Underground Railroad directly in a feature film, it's a subject that could be explored in a meaningful and impactful way. They have a history of creating animated movies with strong themes and characters, so it's possible they might explore this topic in the future.
However, it's important to note that many other films and television shows have depicted the Underground Railroad, and there are also many excellent historical accounts and documentaries on the subject.