Changes

===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. The LMS 'outgrew' its original post-grouping numbering system and carried 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 [[7325 | GWR 9303]] (renumbered to 7325 when rebuilt). Following Nationalisation, SR numbers were generally incremented by 30,000, LMS by 40,000 and LNER by 60,000. 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 - Wikipedia]</ref>

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)*[[7325 | GWR 9303 / '''7325''']] (renumbered when rebuilt)*[[5764| GWR 5764 / '''L95''']] (renumbered by London Underground)*[[34027|SR 21C127 / '''34027 Taw Valley''']] (BR after nationalisation)*[[13268|'''LMS 13268''' / LMS 2968 / 42968]] (LMS 1935, 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===Many diesel locomotives also carried more than one number in the BR era. A The original BTC/BR 1948 system used numbers in the range 10000-19999:{|class="wikitable"!Range!Type|-|align="right"|10xxx|Main line diesel locomotives|-|align="right"|11xxx|Diesel-mechanical or Diesel-hydraulic shunters up to 299&nbsp;hp|-|align="right"|12xxx|Ex-LMS shunters over 300&nbsp;hp|-|align="right"| 13xxx| Diesel-electric large shunters over 300&nbsp;hp|-|align="right"|150xx|Ex-LNER diesel shunters|-|align="right"|151xx|Ex-GWR diesel shunters|-|align="right"|152xx|Ex-SR diesel shunters|} By the mid-1950s the growth of the fleet meant a new numbering policy was introduced in required. Under the new '1957 with Numbering System', diesel locomotives being were numbered in groups according to their ‘Type’ 'Type' (ie power classification):

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 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.  SVR Diesels currently resident which carried more than one number in service are (current number in bold):*[[BR Class 08 D3022 | BR Class 08 13022 / '''D3022''' / 08015]] (1957 Numbering System / TOPS)*[[BR Class 08 13201 | BR Class 08 '''13201''' / D3201 / 08133]] (1957 Numbering System / TOPS)*[[BR Class 08 D3586 | BR Class 08 '''D3856''' / 08471]] (1957 Numbering System' / TOPS)*[[BR Class 08 D3802 | BR Class 08 D3802 / '''08635''']] (TOPS)*[[BR Class 08 08896 | BR Class 08 D4126 / '''08896''']] (TOPS)*[[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 33 33108 | BR Class 33 D6521 / '''33108''']] (TOPS)*[[BR Class 37 37308 | BR Class 37 D6608 / 37274 / '''37308''']] (TOPS)*[[BR Class 40 40106 Atlantic Conveyor | BR Class 40 D306 / '''40106 Atlantic Conveyor''']] (TOPS)*[[BR Class 50 50007 Hercules | BR Class 50 D407 / '''50007 Hercules''']] (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)

* [[SR 34027 Taw Valley |34027 Taw Valley]]: Also ran as sisters 34045 'Ottery St Mary' and 34036 'Westward Ho!', and in maroon livery as ‘Hogwarts Express’'Hogwarts Express'. Appeared as 34022 'Exmoor' and 34046 'Braunton' while at the West Somerset Railway in spring 2004. Ran as 70 'Queen Elizabeth II' during the Queen's Platinum Jubilee in 2022.* [[LMS Stanier Mogul 4296813268|4296813268]]: Also ran as LMS 2968and BR 42968. Being restored Currently liveried as LMS 13268.