47749 at Basingstoke in March 2019. © Justin Foulger
The British Rail Class 47 is a class of diesel-electric locomotives that were developed in the 1960s by Brush Traction. A total of 512 Class 47s were built at Crewe Works and Brush's Falcon Works, in Loughborough, between 1962 and 1968, which made them the most numerous class of British mainline diesel locomotive. They were fitted with the Sulzer 12LDA28C twin-bank twelve-cylinder unit producing 2,750 bhp (2,050 kW) - though this was later derated to 2,580 bhp (1,920 kW) to improve reliability - and have been used on both passenger and freight trains on Britain's railways for over 50 years. Despite the introduction of more modern types of traction, a significant number are still in use, both on the mainline and on heritage railways.
(Information provided by Wikipedia)