On Wednesday, 14 May 2025 07:29:43 BST Andrew Hain wrote: > Where is there official documentation about what these codes are used for?
You can refer to the Open Data Wiki. https://wiki.openraildata.com/index.php/Identifying_Locations#cite_note-1 CRS codes are now officially called "3-alpha codes". It gives an example of Highbury & Islington having 2 codes (HHY is the main code, HII is the code used for the Overground). The secondary code(s) are not used by the public but they can appear in operational documents, such as the Crossrail Timetable Planning Rules with codes such as PDX, FDX, LSX, ABX.
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