Eh... fake sky. Very obvious!

Not necessarily fake, but faked. It looks like it was either pasted on top with feathered edges, or the artist used too large of a brush while working on it and lost the detail around the edges of the trees. My view of it shows he (she?) just got a bit overzealous with the burn tool, which is why the cloud in the middle has so many artifacts in it. If you look at the trees directly below that, the edges are much darker than they should be, suggesting extensive use of burning is present. It's a cool pic, but if it were me, I'd work on it a bit more and resubmit.

Oh damn it, sorry guys, i uploaded the wrong version (old one).
I'll upload the final Version in a few seconds, hope the guys from interfacelift will change it.
Sorry

awesome pic!! love it

Where is this railway?? I hope you can give me an exact location, or at least a nearby village or city?

Thanx!

Bavaria / Germany

I had tis phot on desktop for one week min. Very great work!!!