Your description of the journey out of London was incredibly accurate (there's a bit of nice countryside around Sevenoaks, with the North Downs, but you're going through tunnels for most of that), and then Tonbridge station - at least in its modern incarnation - has the exact dreary, impersonal and moderately grim atmosphere that you'd want for that scene.

Aw, well that is good to know! (I did look up specific details for some things but I wrote the description of the scenery with an airy confidence that that's the basic London perimeter scenery anyway, I don't even need to look, ahem. But clearly also, it is. XD)

Ooh! Might I enquire a bit more into your war-centric train ideas - that sounds very compelling? :)

Well, it was summer when I am always pretty ill, and there were reasons why Sir Robert wound up taking Catherine back on a train from France, and it was probably all quite tragic for other characters and h/c stuff. I was thinking about it again the other day, differently, and I think I could pull something workable out of it perhaps, but OTOH, I might want to do something else entirely. I think I would like to write them again at least once. Maybe I'll do the murder in the end, heh. I worked out some of that, although not unimportant details of exactly where they were trapped in the snow and how, who got murdered or whodunnit. Catherine was Unnecessarily Brave though. XD