From Lille? The train number changes. The Lille - Kortrijk stretch is 18XXX. It is coupled there with the 7XX from Poperinge, continuing to Ghent and Antwerp. And I agree it's not clear to people who don't know that. (But maybe today with the strike you do need to change trains).

This was such an insightful part of your presentation.

Thats's right. Thank you for pointing it out.

(Mon impression est que BlueSky est plus vivant que Mastodon. J'ai un compte Mastodon, mais je ne sais plus comment il 's appelle mdr)