Passenger association Rover says the government is short-changing international rail travellers by not paying for enough border control at Amsterdam Centraal.
Since the EU’s Entry/Exit System took full effect in April, non-EU citizens crossing the Schengen border must give biometric data, which means extra checks at the station.
Rover says the Royal Netherlands Marechaussee has not added staff, and there are no e-gates like those at Schiphol.
Eurostar says it carries many British, American and Chinese passengers, and up to two thirds of its trains have left late since April.
Because of the long waits, only 450 passengers may now board each train at Amsterdam Centraal, down from 600, although a train holds 900.
Eurostar pays millions a year for the checks and passes the cost on, about €4 per passenger by Rover director Daan Zieren’s estimate, while airlines at Schiphol and ferry services pay nothing.
The Ministry of Justice and Security says Eurostar accepted this arrangement and calls the service a private rather than a state interest.
It says extra capacity and e-gates are under discussion, but Eurostar must stick to the agreed number of passengers per train.
If the queues have you rethinking your trip, check out our guide to train travel from Amsterdam.