French operator SNCF has previously asked passengers to self-declare as 'Monsieur' or 'Madame'.
The EU's top court ruled on Thursday that requiring rail passengers to declare a gender when buying a ticket is in breach of the EU's General Data Protection Regulation (GDPR).
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Gender irrelevant for taking the train, top EU court rules
https://www.euractiv.com/section/tech/news/gender-irrelevant-for-taking-the-train-top-eu-court-rules/