The Question and Answer section for The Girl on the Train is a great resource to ask questions, find answers, and discuss the novel.
You can find the text in question on Page 2 of the Front Matter, two pages past the dedication page. The sections you've references can also be found on Page 58.
Tom and Rachel divorced after Rachel grew depressed by their infertility and he began cheating on her with Anna.
The narrators are woman so we get a female perspective through the story. The women value themselves through their looks, sexuality, and their ability to have children. Anna is confident and secure. She is good looking, married, and a mother....