Boxcars Are Dirty is part two of the ten-part book series Adventures of Dennis the Duck. After spending a night in the woods, Dennis finds himself on a chicken truck and left at a farm. Things don't go well. Catching a ride on a freight train, Dennis arrives in an unfamiliar city where he experiences some city landmarks. These adventures present excellent opportunities to learn about well known and unknown places of interest in America. His journey spans the entire east coast of the United States and includes landmarks from Savannah, Charleston, Jamestown, Williamsburg, Assateague Island, Ocean City, Washington D.C, Valley Forge, Philadelphia, New York, Sleepy Hollow, Boston, and Bar Harbor; after which his travels come full circle as he finally finds his way back home.

This Read-To-Me series is perfect for classroom or homeschool instruction, or simple entertainment reading. Teacher or adult learning activity packets are available online which include vocabulary from each book, a corresponding glossary, reading/listening comprehension questions, related topics for expanded discussion, a text only transcript of the book, posters, as well as student coloring and activity pages.

Narrated video presentations of each book are also available on the Dennis the Duck website.