Book excerpt: Papa says it's the sound of leaving that speaks to my soul... The poignant words of two-time Coretta Scott King Award-winning author Angela Johnson and striking images from fine artist Loren Long join forces in this heartbreaking yet uplifting picture book about a boy, his love for trains, and his adulation of one legendary engineer. It's the story of a hero lost and a hero discovered, of a dream crushed then reawakened, but mostly it is a story of the force that sustains the human spirit -- hope.