Talyllyn Railway 'Sir Haydn' (ex Corris Railway) at Towyn.

The last picture shows the end result of my normal process, but this time using gimp-2.10 and my updated plugin. Before that, a look at two alternative options for (slightly) more shadow detail - Advanced Tone Mapping on its own, and the new Shadows-Highlights tool.

First, the camera's own jpeg, resized to 900 pixels high.
Camera jpeg
------
Second, from the raw photo at 0EV.
0EV raw
------
Third, the 0EV raw shot with Advanced Tone Mapping.
Raw with Advanced Tone Mapping
------
Fourth, with an added curve for more contrast.
Add curve for contrast
------
Fifth, gimp-2.10 adds a Shadows-Highlights tool in the Colous menu, here at values of 100 and 50.
Raw with Shadows-Highlights
------
Sixth, add default values of GEGL unsharp mask to Shadows-Highlights.
Add unsharp mask
------
Lastly, my normal process: three exposures, local contrast enhancement, advanced tone mapping, curves, unsharp mask - for 2.10 I'm using the GEGL unsharp mask.
Three exposures plus all the bells and whistles