Richard Trevithick's 'Puffing Devil' was the world's first passenger carrying steam road locomotive. It was designed and first tested by Richard Trevithick and friends on Christmas Eve 1801 when they drove the vehicle up Camborne Hill in Cornwall.
 
The success of this first Camborne Hill run led to the testing of the world's first steam railway locomotive at Penydarren in 1804. Trevithick subsequently  went on to build the 'Catch-Me-Who-Can' passenger train - the world's first fare-paying passenger railway near Gower St. in London in 1808.
It was the first engine to use high pressure steam. James Watt thought that such pressures were dangerous and is said to have remarked that Trevithick deserved hanging for bringing such a thing into the world!
There are no known surviving original drawings of  the 'Puffing Devil' . This model is loosely based partly on sketches and partly on the Dredging Engine in the Science Museum in Kensington which was manufactured only two years later. Also, in the interests of ease of model construction, changes have been made - so the completed model does not pretend to be an accurate scale model, but it does reflect the essence of the original engine.