Train car orientation on slopes

[bennidhamma@gmail.com]

Apologies if this question has been asked. I couldn't find a similar question from a search. And further apologies for asking a question about the train car manager - I know it's just demo code, but I'm still trying to use it as a starting point.

I'm almost happy with my train, but what I'm seeing now is that when the train goes up and down hills, the cars don't orient to the slope. has anyone else encountered this? And/or does anyone have any idea how to support rotating the cars so they look more natural? It looks pretty odd, here's a picture:



thanks for any help!