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The class numbers were assigned under the "TOPS" computer system (it's an acronym but I'm not sure what it stands for) - before this locos were assigned numbers deriving from their HP output (I think - not sure about this as some powerful locos got low numbers). Diesels had a D prefix, electrics an E prefix. Hence you have D8000 (the first loco of what became Class 20). The nicknames derive from a variety of sources - "Deltic" comes from the design of their powerplants, "Castle" class steamers were mostly named after castles, "Warship" class diesel-hydraulics were named after Royal Navy ships. Class numbers seem to be assigned with some care (for example, electric locos tend to be from the 70s up to the low 90s, "97" was used for locos handed over to the R&D department, DMU sets tend to be in the 100s, etc). <br />
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