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After the end of steam in the late 1960s, the 'D' prefix was omitted so that, for example, D821 became 821. Classes 35 and 52 with their cast numbers and number plates had the 'D' painted out (or sometimes removed), although enthusiasts sometimes removed the paint to leave the original prefix and number showing.
A further and more significant renumbering was carried out in the early 1970s after BR introduced [[TOPS codes]] at the end of the 1960s. Diesel locomotives were allocated into classes with the class being the first two digits in the new locomotive number. D3022 was allocated into Class 08, resulting in another new number of 08015. Certain classes slated for early withdrawal were allocated a class number and but never received the five figure TOPS number, these included the Class 11 and the WR diesel hydraulic Classes 14, 35, 42 and 52 now resident on the SVR. The Class 50 was introduced after TOPS
SVR Diesels currently resident which carried more than one number in service are (current number in bold):
*[[BR Class 09 D4100 | BR Class 09 '''D4100''' / 09012]] (TOPS)
*[[BR Class 09 09107 | BR Class 09 D4013 / 08845 / '''09107''']] (TOPS / Rebuilt as Class 09)
*[[BR Class 50 50007 Hercules | BR Class 50 D407 / '''50007 Hercules''']] (TOPS)
*[[BR Class 50 50026 Indomitable | BR Class 50 D426 / '''50026 Indomitable''']] (TOPS)
*[[BR Class 50 50031 Hood | BR Class 50 D431 / '''50031 Hood''']] (TOPS)
*[[BR Class 50 50033 Glorious | BR Class 50 D433 / '''50033 Glorious''']] (TOPS)
*[[BR Class 50 50035 Ark Royal | BR Class 50 D435 / '''50035 Ark Royal''']] (TOPS)
*[[BR Class 50 50044 Exeter | BR Class 50 D444 / '''50044 Exeter''']] (TOPS)
*[[BR Class 50 50049 Defiance | BR Class 50 D449 / '''50049 Defiance''']] (TOPS)
==Different numbers carried in preservation==