"A kid hack was a horse-drawn vehicle used for transporting children to school in the late 19th and early 20th century in the United States. The word hack, meaning a horse-drawn cab, is short for hackney carriage. The vehicle was actually powered by both horses and mules, and usually loaded at the rear to avoid frightening the animals. In those days, most elementary children in rural areas attended one-room schools."@en . . .