Thomas the blue train works all day while Percy the green train works all night. But what exactly do they do? Told in the simplest language, here is a charming tale of a day and night on the Island of Sodor. Bright and Early Books are perfect for beginning beginner readers! Launched by Dr. Seuss in 1968 with The Foot Book, Bright and Early Books use fewer and easier words than Beginner Books. Readers just starting to recognize words and sound out letters will love these short books with colorful illustrations.