Eurostar will add a fourth direct train service from London St. Pancras to Rotterdam Centraal and Amsterdam Centraal stations from September 5.
The fourth service will run on weekdays, departing London at 6.16am and with a journey time of just over three hours to Rotterdam and just under four hours to Amsterdam.
It will allow Eurostar to carry up to 3,600 people a day between London and the Netherlands – the equivalent of 18 plane journeys.
According to the rail operator, a Eurostar journey emits up to 93% less CO2 than a plane journey, with the carbon footprint of one flight the equivalent of up to 13 Eurostar journeys.