Ghost Station No. 13
Aron and Crosalis were lonely space drifters, transparent and without physical form. Aron turned himself into a train station (Ghost Station 13), so that he could have galaxy train passengers to land and play with his sister Crosalis. The 999 landed on station 13, but was trapped. Aron asked Maetel to provide her psychomagnetic waves (i.e., life energy), so that Crosalis could play with Tetsuro in physical form. Meanwhile, Galaxy Railways decided to destroy the ghost station, and advised the 999 to disembark immediately. The 999 could not escape in time, but Aron and Crosalis intercepted the destruction waves, out of gratitude for Maetel and Tetsuro.
Aired 05/02/1981EP 106 - Ghost Station No. 13

Galaxy Express 999
After witnessing the death of his mother and being left for dead at the hands of Count Mecha, ten-year old Tetsuro Hoshino is awakened by a mysterious woman, Maetal. In exchange for only his company, Maetal offers him the ride of his life on the Galaxy Express 999. It is said that those who travel aboard the legendary train to the end of the line can receive a free mechanical body and with it, immortality.
Impoverished and alone, Tetsuro leaps at the opportunity and joins Maetal on a quest that will span the cosmos. As the Galaxy Express 999 makes its way across our solar system and beyond, Tetsuro is drawn deeper into a dangerous universe where peril lurks at every stop.
(Source: Discotek)