Galaxy Express 999
銀河鉄道999 (original)
In a distant future, Tetsuro a human boy who wants his body replaced with a robotic one. This is possible, but to do so he has to reach the Immortal Planet onboard the space train Galaxy Express 999.
Starring Masako Nozawa, Masako Ikeda, Hitoshi Takagi, Kaneta Kimotsuki
Watch "Galaxy Express 999" on Tubi TV released in 1978. It's a action & adventure and animation show, and has a rating of 7.8 out of 10 from Imdb which is usually fine for this kind of show, and is currently available to watch for free.