Good subject. I think it would be good to get more of the crane part in the background, if you had taken it from a different angle, further to the right, methinks. But good overall.
This picture has a great idea behind it but I think it would have been improved with slightly more in the picture. That would give us a greater sense of it's vulnerability--seeing a huge crane that once had so much power that now has none. Other than that, the colors are great and like I said, it's a great idea for a composition.