The French industrial action starts today, Tuesday at 7PM, and runs until 8AM on Thursday.
TGV services will bear the brunt of the disruption: half of all services between Brussels and Paris are being cancelled.
Eurostar is abandoning four services between Brussels and London. Passengers will have to clamber aboard the remaining services.
Only one Thalys service is being cancelled: the 6:55 from Paris to Brussels.