Hi Patrick.
Thanks for your comments.
I'm a german and sorry, i do not speak any french. I only used babelfish.altavista.com to translate your question and the translation is very poor...
So i try to answer you questions.

The trains and waggons are made with default bitmaps and so in the moment there is no easy way to add more colors or s.th. like that.

BUT... maybe i could add some new train and waggon models to catrain. Maybe you want to create them?
If yes, please write back in the forum and we could talk about the details doing that, ok?

Rotation platform: see the answer i wrote to keimpe, please...

Kind Regards,
Daniel