He studied at Birmingham School of Arts and Crafts and one of his landscapes, Cornish Harbour, was exhibited at the Royal Academy; it is now in the Tate collection.
An otherwise undistinguished career was interrupted by World War II, when he worked as a draughtsman for the Air Ministry while perfecting his gift for drawing cartoons.
His cartoons were seldom political, except when he caricatured bureaucratic absurdities, and his early subjects typically found humour in the difficulties of life in Great Britain during the second World War.
His drawings soon started to include railway scenes and he gradually developed a unique concept of strange, bumbling trains with excessively tall chimneys and silly names.
In 1947 his cartoons came to life on the stage of the Globe Theatre, London, in "Between the Lines", a scene for Laurier Lister's revue Tuppence Coloured, with Max Adrian as an eccentric signalman at Friars Fidgeting Signal Box.
In 1953 Malcolm Muggeridge became editor of Punch and began systematic changes, but Emett continued to publish his work there, albeit less frequently.
When commissioned, it played Rameau's Gigue en rondeau II from the E-minor suite of his Pièces de Clavecin when striking the hour and half-hour.
The Ontario Science Centre in Toronto has a collection of about ten Emett creations and every December displays the restored working pieces, usually under the title "Dream Machines".
[citation needed] There is a permanent exhibition of representative examples of Emett's work at Stoneywish Nature reserve in Ditchling, East Sussex.