Meitantei Conan: Haibara Ai Monogatari - Kurogane no Mystery Train

The movie will focus on Ai Haibara's past and will reconstruct the Mystery Train arc from the television anime, which shows Haibara and Conan meeting for the first time. The movie will also include scenes from the Kurogane no Submarine (Black Iron Submarine) movie.

(Source: MAL News)