Galaxy Express 999 (Ginga Tetsudo Suri Nain) is a manga written and drawn by Matsumoto reiji, as well as various anime films and TV series based on it. It is set in a space-faring, high-tech future in which humans have learned how to transfer their consciousnesses (but not their consciences) into mechanical bodies, thus achieving practical immortality. The manga won the Shogakukan Manga Award for shonen in 1978. The anime series won the Animage Anime Grand Prix prize in 1981.
The number, "999", in the title is pronounced "Three-Nine", as opposed to "Nine-Nine-Nine" or "Nine hundred ninety nine".