"The Railway Series" is a collection of children's books created by Rev. W. Awdry and later continued by his son, Christopher Awdry. The series features anthropomorphized trains and their adventures on the fictional Island of Sodor. The stories emphasize themes of friendship, teamwork, and problem-solving. The first book, "The Three Railway Engines," was published in 1945, introducing characters like Thomas the Tank Engine and Edward the Blue Engine. Over the years, the series expanded to include numerous characters and stories, becoming a beloved classic in children's literature and inspiring various adaptations, including the popular television show, Thomas & Friends.