Here is is Trevor...
I opened your conversion in SEP and did the following:
Amplified the whites by 10% as a global change.
Selected the top , lightest portion of the rock centered on the rails in the foreground and increased the size of the control point buy about a third. I increased the brightness of this control point by about 23%. This lessened the overall 'dark' effect you were going for so I added control points with no changes (cancelled out the brightness adjustment) on either side of the tracks and at the center point below the sky. This allowed the changes to impact primarily the wood, rocks and rails in the foreground.
One could fine tune this quite a bit more but you get the idea.