Thanks a lot for the feddback, Maris and Walter!
The abyss in the carriage was not able to be totally recovered in the black and white, but I thought it interesting that I can make out some detail in ceiling in that image, but not in the colour image, which is, as you say, otherwise a fair bit brighter.
I really, really enjoy reading what you guys get out of the images posted here. I've not spent much time in life pondering these sorts of things, and still find myself simply asking "did i capture what it looked like", but I think that you're opening my mind a bit and I'm grateful for it
Regarding the circular polariser, yes! I do have one, but I did not think to bring it out that day. A good reminder!