There were dozens of types of small shunter built.
From the guardian.co.uk
Hazel Armstrong's book will be launched at this event, as well as an unveiling of a relocated memorial to Wellington shunter Jack Neha.
From the scoop.co.nz
They have converted an old heavy shunter into a hybrid, slashing its fuel consumption by 40-50%, according to Klaus Hiller, who is in charge of the project.
From the economist.com
More examples
A small locomotive used to move cars around but not to make trips
A switcher or shunter (Great Britain: shunter; Australia: shunter or yard pilot; USA: switcher or switch engine, except Pennsylvania Railroad: shifter) is a small railroad locomotive intended not for moving trains over long distances but rather for assembling trains ready for a road locomotive ...
A railway locomotive used for shunting; a switcher; A person who carries out shunting operations
A person who works under the direction of a turner (q.v.) to move shunting locos and others in and out of tight spots on shunting sidings, e.g., to allow the turner to move the main loco to some desired location. Shunter is also used to mean 'shunting locomotive'.
A railway worker. When rolling stock is shunted (moved) about to form trains, the Shunter had the dangerous job of coupling the carriages and wagons together, which meant getting in between them, leading to a high risk of injury. ...