Charlie the Choo-Choo was a book purchased by Jake Chambers at The Manhattan Restaurant of the Mind. It tells the story of Charlie the Choo-Choo and Engineer Bob. In the book, Charlie is very friendly and dependable, yet Charlie's smile is often described as being untrustworthy. Charlie bears many similarities to Blaine the Mono.
In Jake's world, the author of the book was Beryl Evans. In Roland's world, the author listed 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.
Wizard and Glass
When Roland and his ka-tet passed through Topeka, they stumbled upon Gage Park. Inside the park, there was a train that looked exactly like Charlie. Jake was the first one to see it and almost fainted. As they were walking away, Jake swore that he saw the train's lights flash at him.