I love the last one. The b&w really adds something, and I also love the fact that it's not your standard railroad lines running in a straight line. Nice!
The DOF you chose for #3 is what makes it so outstanding IMO. The sharpness is just on the curve of the tracks, then falls off as the tracks go off into the distance. It's like a Holga shot. Very, very effective in adding to the mood here.