In the start of this movie there's a little boy with his mother in a blizzard and his mother gets shot. Later the boy meats a woman and they travel through space on a train. Its not Galaxy Railways - The 777 or Galaxy Express 999

Do you know when it came out? Or when you saw it?

It definitely sounds like

Galaxy Express 999

The first of about three movies

-view scene-

view trailer

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They said it isn't galaxy express but your links may jog their memory to see it may just be that movie

If not try this nsite for help http://www.filmsandtv.com/genre.php?gs=2000Sci-Fi
It would be more helpful if you had the date