"The Little Engine That Could" is a children's story about a small blue train that faces a challenging task. When a large train breaks down, the little engine volunteers to pull the heavy load over a mountain. Despite doubts from others, the little engine remains optimistic and repeats the phrase, "I think I can." As the little engine climbs the mountain, it perseveres through difficulties and self-doubt. Ultimately, it successfully delivers the cargo to the other side, demonstrating the power of determination and positive thinking. The story encourages readers to believe in themselves and tackle challenges with confidence.