Great tones, great depth and beautiful subtle colours. Consider "removing" the tree limbs sticking in from the left side. Also, I have the same concern as the black & white you also posted - that of the signal box acting as an unnecessary distraction. It's angularity is the first thing I see after the sun as it is in such contrast to the flow and gentle shapes of the rest of the photograph. Clone it out and you will have a "less realistic", but more ”artistic" representation of what is a beautiful scene. You may know it is missing, but your audience won't (except for that 1 in 1000 train buff who knows every signal box along the line) and you'll end up with a stronger photograph.
Just my objective 2 cents worth.
