System of Codes
The coding system had its origins in a reorganisation of locomotive operation and maintenance on the LMS in the 1933-35 period. It grouped all sheds into districts with a main shed, given the district number followed by the letter A as its code, and subsidiary sheds with the same number followed by B, C, or D etc. Many sheds were also responsible for sub-sheds where day-to-day servicing could be carried out but which lacked the facilities for intermediate or heavy overhauls. The extension of the system to all regions was brought into use in 1950, each region being given a block of district numbers:
- 1 – 28 London Midland Region
- 30 – 41 Eastern Region
- 50 – 56 North Eastern Region
- 60 – 68 Scottish Region
- 70 -75 Southern Region
- 81 – 89 Western Region
Many codes changed as districts were re-organised and as regional boundaries changed over the years. For example, the former LMS shed at Goole was initially 25C as part of the Wakefield District. In September 1956 the district was transferred to the North Eastern Region and split between districts 53, 55 and 56; Goole became 53E in the Hull District. This district was itself merged with the York District in January 1960 and so Goole was re-coded again to become 50D. The changes accelerated with the contraction of the railway network and modernisation, both of which reduced the number of locomotives in use. For example, the Inverness district had five sheds and seven sub-sheds in 1950 but these had been reduced to a single shed by 1967.
On 6 May 1973 all the remaining depot codes were replaced by new two-letter codes. These no longer included any kind of district hierarchy, but were more suitable for use with the TOPS operating management computers.
Read more about this topic: List Of British Railways Shed Codes
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