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add note on use of Ordnance Survey Maps
:"''Additionally, you may satisfy the attribution requirement by providing a link to a place where the attribution information may be found''"
==== Ordnance Survey Maps / Crown Copyright ====
Guidance on the use of Ordnance Survey Maps is given [https://www.ordnancesurvey.co.uk/business-and-government/licensing/crown-copyright.html here]. In summary, Crown copyright exists in Ordnance Survey mapping for 50 years from the end of the year in which it was published. You can copy mapping that is older than this without a licence.
=== Dating Current Events ===
When discussing the current situation regarding an engine, project, or similar, you should mention the date at which you're writing the comment, e.g. "as of January 2014, locomotive 12345 was being overhauled...". If you use phrases such as "currently" or "at the moment", it can be hard for a reader to work out whether the information is still correct. A date may also encourage someone to add more up-to-date information at a later point in time, as they will be made aware that the page hasn't been updated for a while.
