First impression: Excellent entry for "At Work", it really gives the impression of someone working. The image looks a little bright to me - was that intentional?
Composition: I very much like the diagonal lines throughout the photo. The tracks could have led the eyes out of the image, but the man and his machine at 90 degrees to the tracks keep the viewer nicely in the picture. Personally I like the crop, it seems to me that a closer crop would take away from the picture. I love the weeds to the top left. And, even though purple tones are not my favourites, I like them here. I like the small purple line surrounding the image, and heavy black border is right IMO.
Technical: The picture is well in focus, no problems there. Light, to my eyes it's a bit bright, as if you'd taken the picture right close to the middle of the day, and the sun was harsh. I really don't know if different light or taking the picture at a different time of the day would make it better or not, but it would be interesting to try.
Overall: I like this picture, it's a good entry to the challenge, and your score is quite good, but I don't think it's your best shot (duh!). Anyway - I really like your "Green Eyes" picture, and I don't have a pet or even like animals all that much (I'm scared of them!). Your work is original, very nice.
I think the black border is a bit heavy but it matches the heavy shadows on the tracks. The perspective makes your subject look small and isolated, which really works for this shot. Nicely done.
Wow - striking composition and contrast though i'm thinking maybe straight monochrome would have looked better. I have a close up rail shot myself that seemed to lose something when i tried sepia and I feel this might suffer the same. Excellent effort all the same - 8
Creates the sense of a very hot day in the sun and long, long way to go until quiting time. A composition to make the worker a little larger would have been better.
I like the composition and the idea but I am not sure what it is a picture of. I think the photo would have benefited by getting a bit closer to the subject.