Answer:
I hold two meanings. With one I may be broken, with the other I hold on. What am I?
I fly forever Rest never.
I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?
My first though water cures no thirst my next alone has soul and when he lives upon my first he then is called my whole.
I come with a train and go with a train and the train doesn't need me but can't go without me.
Give it food and it will live, give it water and it will die.