Thanks for the answer, Paul. I can see why it fascinates you. That's an original design that I've never seen before... interesting to know about it now. Thanks.
I'd be interested to know what you saw here. Really.
Basically, I like complexly-constructed old machinery and buildings; this bridge is a bit of a different that usual drawbridge in that the whole center section rises vertically (instead of one end lifting), balanced by those huge concrete counterweights.
The second reason I liked the image was the challenge of taking it -- this was taken from a moving train, and is rather the counterpoint to a panning shot. In this case the camera is moving, and there's one and only one instant at which to capture this particular view/composition; one which is not available to the pedestrian photographer.
To get an almost-perfect composition (only a tiny bit of cropping needed) and a sufficient level of detail was under those conditions was, to me, a pretty good accomplishment. I knew well that none of this would be apparent to the voters or be factored into the score, but you asked ...
I'm sorry to say that there's not much here to hold my interest. I'd be interested to know what you saw here. Really. I'm not just acting ugly. *grin* (not voting yet)