D7659 was built as a Class 25 with the revised ventilation, by Beyer Peacock in Manchester, entering traffic on the London Midland Region in July 1966. Renumbered to 25309 in April 1974, and then 25909 in December 1985, before withdrawal in September 1986. Now in the ownership of the Waterman Railway Heritage Trust, it spent 23 years out of traffic until a comeback in 2021.
Derby Sulzers loco history.