|This article is about the magazine story. You may be looking for the episode or the Chinese book.|
Percy blows his whistle at 'Arry and Bert and they blows their horns at Percy. 'Arry and Bert think diesels can do better than steam engines, but Percy disagrees with them and tells them his whistle is better than their horns. So Percy practices blowing his whistle loudly. Percy comes to 'Arry and Bert, and blows his whistle as loud as he can. 'Arry and Bert are surprised. Next, he surprises Thomas with his loud whistle and Thomas bashes into his trucks. Percy blows his whistle at Bertie and makes him skid across the road. Thomas is cross with Percy for being careless and he promises Thomas not to do it again. The next morning, Percy wants to blow his whistle, so he does. Trevor hears his whistle and bumps into logs, one of the logs turns into a giant snowball and crashes into Percy. He is trapped. Sir Topham Hatt is cross with Percy and tells him to use his whistle when the time is right. Percy comes out of the tunnel and stops at the snow drift ahead of him. He hears Thomas' whistle, Percy blows his whistle the loudest of all. Thomas hears his whistle and stops just in time. Sir Topham Hatt is proud of Percy and he is a really useful engine.