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→Renumbering in service: additional info
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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 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, 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>
===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 hp|-|align="right"|12xxx|Ex-LMS shunters over 300 hp|-|align="right"| 13xxx| Diesel-electric large shunters over 300 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):
{|class="wikitable"
!Range
|Over 3000 hp
|}
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 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.
==Different numbers carried in preservation==