Thanks, Kevin, for posting these super photos.
I was puzzled how you got the colours of the train, especially the carriage, in your photo on the bridge over the creek so bright even allowing for the capabilities of Photoshop. Attached is one of my efforts at this location - straight out of the camera without any processing other than shrinking the file to bring it within NGDF's size requirements. It's more or less the same view as yours and I intended this to be a silhouette shot, quite feasible when the sun is so low in the sky. It's not a true silhouette as there's a little light reflected off the creek onto the train, but not enough I'd think to allow it to be brightened up as much as you have achieved. For what it's worth I was using a Fuji X-H1 but I doubt whether its performance is markedly different from a Nikon D850. Are there any tips you can post?!
Best wishes,
James