Alas, this isn't happening. I did the research, had a narrator I really liked, but got bogged down irrevocably on chapter 2. I am going to do something else and try to come back to it.
The next book, (unless I get fed up with it) is going to be set in the seventeenth century--1688, to be precise. The protagonist will be Faith Overton, who is a minor character (in both senses of 'minor') in my second Civil War novel. Her family are known to have moved to the Netherlands, which means I get to research the Dutch Golden Age.
It is presently going very slowly. I am still much taken-up with childminding duties. I love my little grandson dearly, but I still have no inclination to write about trains.