My memory of it is VERY vauge, but I woke up some days age and memories of the movie hunt me constantly. I'm sure it's no dream...
Here goes:
It was a pretty old (70'? 80'?) feature long animated movie, with (I think it was... ) a fox as the main character. In this movie, something happens at the begginig (the forest is being torn down, or the parents of the fox die, I can't recall), so he (or maybe it was a she?) runs away.

One scene that I do recall quite well is one that this animal is walking along some railroad tracks. For a short time, but I'm sure that there was a scene like that.

The color of the movie was very... crayon like? Not the crisp type like e.g.. Snow white.

Also there were couple of beautiful songs, sung by the fox (now I do believe it was a female). Later on, I think she finds a partner...

There were also some scene during the winter, frozen lake, stuff like that...
I saw the whole thing on a TV station, don't know which one, but I'm sure it wasn't a popular one...

Any ideas? I know the whole memory is not much, but it's killing me for some time now... I tried Google, imdb power search, every thing...

Help?

Its not the Fox and the Hound...

Nope, it is not...

OK I'm having the same problem I've been trying to figure this movie out for a long time myself I vaguely remember an old scruffy fox that looked after the younger one. Hope this helps =/