Uncle Bertram Takes the Choo-Choo Train

The Choo-Choo train is common stuff for kids the same age as
Rebecca.

But how many know about Amtrak?

Rebecca has been asking for her Uncle Bertram recently, and told her Bubbie that he is not here now but coming to see her on the train very soon.

To understand all this requires a great deal of abstract thinking which
militates in favor of the conclusion that she is as smart as she is cute.