Interesting. From the thumbnail--the rail looked like a pyramid. I like the DOF, but I wish there was something on the more focused area of the rail to enhance interest.
I think that your photo would've been better with a sharper background, to me the blurry background distracts from the idea that you were trying to give with this picture.
7 - Great perspective/angle. Good color. Criticism; wish it were a fraction wider. If the top of that left tower in the background were not cut off, would make this even better in my opinion. Difficult to tell, but seems perhaps a fraction nudge rotation up on the right is needed, not sure. Really like the detail and texture capture at the fore - even sharper still 'somehow' would be good, but likely hard to get the background as it is so who knows.
having the line focus in the foreground makes me think the "end of the line" is closest to me when I think you are referring to the factory as the end of the line.