"Orphan Train" is a historical novel by Christina Baker Kline that tells the story of two women from different eras. The narrative alternates between the life of Vivian Daly, a 91-year-old woman who was sent on an orphan train in the 1920s, and Molly Ayer, a modern-day teenager in foster care. The orphan trains were a real program that transported orphaned and abandoned children from New York City to the Midwest, where they were placed with families. The novel explores themes of family, identity, and the impact of the past on the present.