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==Renumbering in service==
===Steam locomotives===
Steam locomotives frequently carried more than one number during their working life. Renumbering usually came about through company mergers, in particular after the Grouping of 1923, and Nationalisation in 1947, from which only the GWR emerged relatively unaffected. Following Nationalisation, SR numbers were generally incremented by 30,000, The LMS by 40,000 'outgrew' its original post-grouping numbering system and LNER by 60,000carried out a substantial renumbering exercise in 1935.<ref>[https://en.wikipedia. org/wiki/LMS_locomotive_numbering_and_classification LMS locomotive numbering and classification] on Wikipedia</ref> Companies also renumbered for other operational reasons, as happened to [[GWR 1450]].<ref>[https://en.wikipedia.org/wiki/GWR_1400_Class#Into_service GWR 1400 Class - ] on Wikipedia]</ref>Following Nationalisation, SR numbers were generally incremented by 30,000, LMS by 40,000 and LNER by 60,000. SVR steam locomotives currently resident which carried more than one number in service are (current number in bold):*[[813 |PTR 26 / '''GWR 813''']] (renumbered when acquired by the GWR)*[[1450| GWR 4850 / '''1450''']] (entire class renumbered)*[[7325 | GWR 9303 / '''7325''']] (renumbered when rebuilt)*[[5764| GWR 5764 / '''L95''']] (renumbered by London Underground)*[[34027|SR 21C127 / '''34027 Taw Valley''']] (BR after nationalisation)*[[42968|'''LMS 13268''' / LMS 2968 / 42968]] (LMS 1935, BR after nationalisation)*[[LMS Stanier Class 5 45110 | LMS 5110 / '''45110''']] (BR after nationalisation)*[[LMS Jinty 47383 | LMS 16466 / LMS 7383 / '''47383''']] (LMS 1935, BR after nationalisation)*[[LMS Stanier 8F 48773|LMS 8233 / 41.109 / WD 70307 / WD 500 / '''48773''']] (renumbered during war service and by BR following repatriation from the Middle East)*[[LMR 600 Gordon | WD 73651 / '''LMR 600''' Gordon]] (renumbered by the War Department) [[LMS Ivatt Class 2 46443]] and [[LMS Ivatt Class 4 43106]] were built by BR to LMS designs and therefore did not require renumbering after entered service. Manchester Ship Canal [[686 The Lady Armaghdale| Hunslet 0-6-0T 686]], which was originally named "St John" and later numbered 14, was renamed "The Lady Armaghdale" (but not numbered) by ICI.
===Diesel Locomotives===
Existing locomotives were therefore renumbered under this policy, for example the 13xxx series became D3xxx/D4xxx with [[BR Class 08 D3022|13022]] becoming D3022.
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 numberplates 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 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
==Different numbers carried in preservation==