OK, thanks to @bohwaz for clearing up the SNCF luggage rules

See pages 35 and 178 of SNCF's terms of carriage - PDF https://www.sncf-voyageurs.com/medias-publics/2024-07/tarifs-voyageurs-version-5-juillet-2024-VDEF-FR.pdf

Your luggage needs to VISIBLY indicate your name, and NOTHING ELSE

Note: despite SNCF's own luggage labels having a field for telephone number, this is NOT OBLIGATORY

Also the name being visible would be - for example - covered by you writing the name directly on the bag. It does not have to be a separate label

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Also via @bohwaz "Ces dispositions ne s'appliquent pas aux effets ou menus objets que le voyageur conserve à sa disposition immédiate." - the name requirement does not apply to bags you have right with you

But it DOES apply to each of the bags covered by the luggage rules (1 small, 2 large bags) and - for example - were you to leave a handbag on a seat and go to the toilet, SNCF staff could still get arsey

A mess

Want to be sure? Luggage tag ONLY WITH YOUR NAME ON IT, and ON ALL YOUR BAGS

@jon @bohwaz it doesn't specify any font sizes. Label with 36pt Nom and Prénom field names and 0.2pt content would be technically compliant. Can't argue it's not visible. (Technically it also doesn't say which part of the light spectrum it should be visible in.)