All diesel locomotives used in the UK have a classification depending on their specification. For instance, a Class 66 is a type of locomotive that is used by various freight companies including DB Schenker (formerly EWS), GB Railfreight and Freightliner. Other classes of diesel locomotive in use on a regular basis on Network Rails lines include Class 08's, 59's' 60's, 67's and 70's, and diesel units have lots of other numbers. Then on preserved lines you likely to find classes 24, 25, 31, 37, 40, 55 and loads of others, and they all have their own dedicated gang of followers.
There's lots of sites online where you can get more information about the individual classes of loco. A decent starting point could be Wikipedia, but there's hundreds more. Try Google.
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