He/she is based on a BR Class 08 diesel-electric shunter. Over seventy members of this class survive today in preservation, while around 100 remain in service on the national rail network. They were in fact the most successful shunting engines in the world, with 996 of them built. Diesel, 'Arry, Bert, Splatter, Dodge, Sidney, Paxton and The Great Railway Show Diesels are also members of this class.
The Diesel Shunter is painted British Railways black.