For all of the train afficionados on your list "We Got You": From the youngest to the oldest, Kendra suggests some stories featuring trains, fact-packed books and a game & puzzle!
Freight Train Lift-the-Flap
The Boxcar Children (The Boxcar Children Mysteries #1)
The Silver Arrow
Confessions on the 7:45: A Novel
Orphan Train: A Novel
Eyewitness Train: Discover the story of the railroads (DK Eyewitness)