Percy the Small Engine, an 0-4-0 tank locomotive, from the Thomas the Tank Engine and Friends series, 14 August 2005 at Llangollen station during a "Days Out With Thomas" event on the Langollen Steam Railway.
Percy lives on the (fictitious) Island of Sodor with many other locomotives, including Thomas the Tank Engine, Gordon the Big Engine and Henry the Green Engine. He is the smallest and youngest of the principal steam engine characters, and also probably the cheekiest. The "Days Out With Thomas" events at heritage railways like Llangollen (a name which includes two voiceless alveolar lateral fricatives) help introduce railway history to a new generation of railfans.
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