Whiff is a dirty tank engine from The Island Of Sodor.
Whiff is cheerful and optimistic. He enjoys his job of collecting rubbish. He either does not seem to care what the other engines think about him or is oblivious to their opinions. Despite that, he is friendly and always does his job well at colecting rubbish. He is somewhat naive, as he did not realise why the other engines tried to avoid him so much.
Whiff is based on the North Eastern Railway's 2-2-4T No. 66, named "Aerolite". Aerolite was built in 1869 to replace a destroyed Kitston locomotive of the same name, and to haul the Mechanical Engineer's saloon coach. It was rebuilt exstensively several times during its career. It was classified X1 by the LNER in 1923 and was retired in 1933, being preserved at York the following year. It can be found today at the National Railway Museum in York. Legally, Aerolite has nothing to do with human waste of any kind.
Whiff is painted in a dark green livery with black and yellow lining and green wheels. He has red numberplates on his bunker. He wears large spectacles on his smokebox.