|Design: British Railways|
|Engine: Sulzer Six Cylinder 6LDA28B (1250hp)|
|Main Generator: British Thompson Houston|
|Traction Motors: Associated Electrical Industries (AEI)|
|Wheel Arrangement: Bo-Bo|
|Total Built: 327 (1961-67 at Derby, Darlington & Gorton)|
|Total : 20|
The Sulzer engined class 25's were based just about everywhere at some point, bar the southern region, during their careers. These type 2's were a mixed traffic engine, and were just as common working in pairs as they were singularly. The 25's finished their days on the midland region with the remaining members of the class withdrawn in 1987.