British Standards Document
BS EN 12663-1
Railway applications. Structural requirements of railway vehicle bodies. Locomotives and passenger rolling stock (and alternative method for freight wagons)

https://doi.org/10.3403/30279809U

BS EN 12663-1 is maintained by RAE/3/-/11. The current release of this standard is:

BS EN 12663-1:2010+A2:2023 Railway applications. Structural requirements of railway vehicle bodies. Locomotives and passenger rolling stock (and alternative method for freight wagons)

https://doi.org/10.3403/30279809 (published 31/03/2010)

This standard is available from the following sources:

Other historical versions of this standard document also exist:

BS EN 12663-1:2010+A1:2014 [current until 19/12/2023]
BS EN 12663-1:2010 [current until 31/01/2015]