From December 9, passengers will only be able to travel directly between the two cities using the hi-speed train Fyra. That means a sharp hike in fairs of at least 30%.
Discount cards will also no longer be valid on the trains.
Rover accuses Dutch Rail (NS) of abusing its monopoly position. In some cases, people will have to pay double the current price of a ticket, Rover says.
The Hague makes an urgent appeal to keep ordinary services to Belgium
Train tickets to Belgium set to soar in price