Class 53

British Rail assigned Class 53undefined to the single Brush Traction-built prototype locomotive Falcon. While not in any sense a failure, the design was the victim of advances in locomotive technology (specifically, the power obtainable from single low-speed diesel engines) and was never duplicated. It was of the Type 4 classification and was simlar to the Class 47 (and Class 48 and Class 57) having been built and designed by Brush Traction.