I've seen some pretty odd-looking locomotives (the Kitson locomotives for the Ferrocarril Transandino take some beating) but the preserved Aveling & Porter locomotive 'Blue Circle' is certainly striking. Aveling & Porter are better known for road rollers and traction engines, but they also produced shunting locomotives of a very distinctive pattern. 9449 visited Shackerstone in October 2007 for the 'Thomas' events and stayed for the Christmas season.
The principles of this locomotive can be followed by looking at a collection of photographs.
