Percy and Diesel are instructed to take a rusty old organ – the calliope – to be melted down. Percy is determined to save it from this terrible fate. He pitches himself into a race against time to make the organ play before Percy and Diesel reach the Smelter's Yard. Needless to say, Diesel is very unhelpful… After a number of failed and funny attempts, Percy discovers that the solution to making the calliope work is to use steam…the answer was in his funnel all along! It is Sir Topham Hatt's Birthday. He tells Thomas to take Winston, his new track vehicle, with him on his jobs. Sir Topham Hatt wants Winston to see what it's like to be a Really Useful Engine. Salty and Edward tell Thomas and Winston that when Sir Topham Hatt was younger, he would would travel from station to station on his birthday in his favorite open top carriage, sharing birthday cake with the passengers on the platform. Thomas and Winston set off on his rounds. Winston trails off and Thomas is annoyed. Thomas makes Winston travel in front of him. Winston does so, but rolls along very slowly – looking left and right. Thomas bumps into the back of Winston and derails him! But Winston is excited! At last, Thomas lets Winston tell him that he has been looking for the open top carriage and he thinks he has found it.