Early one morning, Percy was working in the yard. He was preparing a train for Oliver, the Great Western. Fodd mode in Mr. Percy, said Toad, as Percy shunted him onto the back of the train. It is quite nice today, Percy replied. I just wish I knew where Oliver was. He's late. I'll miss the road if I was a little late. Before Toad could say another word, Oliver arrived. His two-tone whistle sounded loudly as he rolled in. Oi, mere, oi mere, sorry I'm late. He grumbled. Bulgey was causing trouble again and wouldn't let me pass the crossing. Well, you're here now, begin Percy, but never mind that. Was that your whistle? I don't think I've heard it before. Why does it sound like that? Oh, didn't you know? Oliver chuffed proudly. It's two-tone. Sounds glorious, doesn't it? Anyhow, I would love to say a chat, but as you said yourself, oi, late. Come along now Toad. Hmm, yes, Mr. Weatherman. Right behind you, Oliver puffed away up the branch line. Once again, sounding his whistle, Percy was in awe of the Great Western engine. That afternoon, Percy was talking to Duck about Oliver's whistle. What right does Oliver have to two whistles, he said indignantly? I work hard enough for two, or even three for that matter. Silly, silly Percy. Oliver's whistle is unique to him. We get along just fine with ours. Reply Duck. And besides, boy like mine. When he let out a few peeps. Your sounds know he's two. No need to change it. But Percy wasn't satisfied. When Duck met Oliver, he told him what Percy had said. Oliver found it quite a music. Really now. Hard enough for two, or three, chuckled Duck. That thought Oliver laughed. That afternoon, as Percy took his trucks back to the quarry, he tried whistling like Oliver. He tried it in every station, every crossing. And anytime he saw someone bite along. He whistled and whistled, but every peep came out the same. He was feeling most disappointed. As Percy arrived at the top station, he found Thomas, who was most confused by all the whistling. What happened, Percy? Is something stuck in your whistle? Percy explained about Oliver. Thomas was quick to taunt. Oh dear, are Percy's going Great Western, is he? I say you're on the wrong branch. A little Western is back the way you came. And Thomas puffed away with Annie and Claire about, feeling quite amused. As he laughed, Percy thought he could hear a familiar sound. That evening, Percy was at the harbor with his last train of the day. He was still thinking about Oliver's whistle and wasn't paying attention. We'll be home early tonight, said his driver. The last truck is being unloaded now. We'll be back in no time. But he couldn't be more wrong. As Percy started to move, he peeped his whistle once more, but forgot to check his surroundings. Then came the shout. Look out below, Crite of Voice. Before anyone had time to react, there was a loud thud. A rocking sound coming from Percy's boiler. A massive crate of mechanical parts had come loose from the crane above. Percy's boiler was inspected. At first, no one noticed anything wrong. Then, it happened. As his driver pulled the whistle chain, there was a shrill hissing sound. The fireman who had been examining him jumped in surprise. Well, that's torrent, he said. The crate split your whistle in half, right down to the base. He shan't be going anywhere just yet. It's not safe to travel without a whistle. Percy sighed. He knew he was in quite a mess. Soon, Duck arrived to help Percy back to the big station. He said nothing, but couldn't help laughing as he pulled Percy away. They arrived at the big station just as Oliver had pulled in with his last passing train. Oliver asked Duck innocently. That's me, replied Oliver, glancing at Percy. But if you're Oliver, then you will be pulling. Well, that's Percy, didn't you know? You cannot be. He's got two whistles. And everyone knows Percy's only got the one. Actually, Duck, chuckled Oliver. Even though it might look like he's got two whistles, I think he hasn't even got one at all. Or if he does, it's a shrill. Do you know Oliver? Whether it's one whistle or two, it's not a pleasant sound at all. The hissing was indeed coming from Percy's broken whistle. The green engine was quite upset indeed. But he now knew not to let envy get the better of them.