The BR class 47 was once one of the most numerous on British Rail, but numbers are now quite low.
https://en.wikipedia.org/wiki/British_Rail_Class_47
Current operators include Great British Railfreight (GBRf) (3 locomotives), Freightliner (1 loco) & ROG (6 locos). WCRC, LSL & Vintage Trains (VT) have class 47s which are used on main line railtours.
More than 30 class 47s have also been preserved.
Tony