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The Little Engine That Could is an American fairytale (existing in the form of several illustrated children's books and movies) that became widely known in the United States after publication in 1930 by Platt & Munk. The story is used to teach children the value of optimism and hard work. Based on a 2007 online poll, the National Education Association named the book one of its "Teachers' Top 100 Books for Children". A 1949 recording of the story was inducted to the National Recording Registry in 2009.

The story's signature phrases such as "I think I can" first occurred in print in a 1902 article in a Swedish journal. An early published version of the story, "Story of the Engine That Thought It Could", appeared in the New-York Tribune on April 8, 1906, as part of a sermon by the Rev. Charles S. Wing.