Russia isn't the only group interested in doing terrorism in The Netherlands. Recently the Farmers Defense Force and Extinction Rebellion have caused far greater disruption.
Could it be Russia? Obviously. But in my opinion the odds are less than a coin flip.
> Recently the Farmers Defense Force and Extinction Rebellion
Why derail trains though, especially in regards to the latter? Given it's one of the most environmental ways for transportation. Besides, groups like that tend to want to take responsibility, the whole point is to get attention to their groups.