From this report from the Committee of the Regions in 2017

https://op.europa.eu/en/publication-detail/-/publication/630fd4e0-3772-11e6-a825-01aa75ed71a1/language-en

Then 161000 people a DAY cross the Belgium-France border Lille/Kortrijk/Tournai, but only 3000 of them do it by train 😳

#CrossBorderRail