Eurostar launched a direct rail service from London to Amsterdam in April 2018. Thanks to competitive pricing to entice passengers away from low-cost airlines (or to avoid passengers leaving rail in favour of air travel) this service has proved popular. In response, Eurostar says it will launch a third direct rail service to Amsterdam in June 2019. Tickets for this service are now available for purchase.
https://railway-news.com/eurostar-third-direct-rail-service-london-amsterdam/