31284 at Saltley in April 1987. ©Steve Jones
The British Rail Class 31 (aka Brush Type 2) locomotives were produced following the launch of the Class 20 and were one of the pilot scheme designs by British Railways which were intended to replace steam locomotives. Originally destined for the Eastern region, the class became known for working on both the Western and London Midland regions too, working even further afield later in life. Throughout their life, the class saw several modifications and five different subclasses existed. The class held a long and varied lifespan, working a variety of local and express passenger sevices, freight and engineers trains - with some locomotives working on the mainline as late as 2017.
(Information provided via Wikipedia)