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Discover how people powered all sorts of machinery before the wonders of electricity took over at this indoor family festival dedicated to the golden age of steam. Visitors can build their own train track out of Lego, try to win prizes in the coal-shovelling competition (which in its original era would likely be considered an internship), climb into a real steam carriage and even ride around King's Cross on full-size pump trolleys. Events will take place in The Crossing, a section of the Granary Building, where two model railways will be on display.