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"Harold is a helicopter who lives at Dryaw Airfield near Thomas's branch line. Percy was the first of the Fat Controller's engines to meet him. Percy thought Harold was noisy and Harold kept on boasting about how up-to-date he was. Percy challenged him to a race and won, but Harold proved just how useful he was later by parachuting hot drinks to Percy's passengers when he was stuck in a flood. Now they are firm friends." 
"In a railway family Harold can hardly avoid having a high profile. He brings a welcome spot of dash whenever he appears even if the noise he makes is slightly wearing, he is good hearted and the engines are always pleased to see him. As far as we are aware, Harold has never flown outside the island of Sodor." 
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