The Class 73 is a type of diesel-electric locomotive used primarily in the United Kingdom. Built between 1962 and 1968, these locomotives were designed for both passenger and freight services. They are notable for their versatility, as they can operate on both electrified and non-electrified tracks. With a distinctive design, the Class 73 features a powerful diesel engine paired with electric traction motors. This allows for efficient performance in various operational scenarios. The locomotives are often recognized by their unique cab design and have been used by several operators, including British Rail and Network Rail.