I really love the polarizing effect on the sky and the contrast between the roller coaster and the sky. However, this picture has too much roller coast for me. Maybe if you had put the coaster in front of the really blue sky and tightened up on it, it might have been a better photo
The good thing is it's an interesting geometric pattern, and the shot is technically solid. I'm not sure what the focus of the image is supposed to be, though. The bright spot in the lower left?