Charlie the Choo-Choo (first appeared in The Dark Tower III: The Waste Lands)

A book purchased by Jake Chambers at the Manhattan Restaurant of the Mind. In Roland's world, the author of Charlie the Choo-Choo is Claudia y Inez Bachman. This name holds special significance. It has 19 letters, a special number in The Dark Tower Series. Also, Claudia y Inez Bachman is the wife of Stephen King's pseudonym, Richard Bachman.

Charlie the Choo-Choo is mentioned in the following books:

Cell (Jan 2006)

Tom points out a children's ride called Charlie the Choo-Choo at the Northern Counties Expo.

They came onto the midway between the Krazy Kups and a half-constructed kiddie ride called Charlie the Choo-Choo. “Look,” Tom said, pointing. “Oh… my… God,” Dan said softly. Lying draped across the peak of the train ride’s ticket booth was the remains of a charred and smoking red sweatshirt—the kind sometimes called a hoodie. A large splotch of blood matted the front around a hole probably made by a chunk of flying schoolbus. Before the blood took over, covering the rest, Clay could make out three letters, the Raggedy Man’s last laugh: HAR.
- Part 7: Kashwak / Chapter 15