The Class 20 is a small Bo-Bo diesel locomotive produced by BR in the late 1950s and early 1960s. They are sometimes also referred to as the English Electric Type 1. The Class 20 was a freight only diesel design producing 1000 horsepower, ideal for light mixed freight traffic. In total, 228 of the class were built across two production runs. As advancements in diesel traction came thick and fast through the 1970s the locomotives found themselves comparatively weak and relegated to secondary duties.

The Class 20 model is fitted with a three pole motor connected to the motor bogie via a driveshaft and worm. Traction tyres give the model extra pulling power and an 8 pin DCC socket allow for digital operation.