There is a transit strike in the Netherlands from today until, and I believe, including, June 11. Check the website 9292.nl for specific information. It does not include trains.
Before anyone gets worried, this is not a nationwide strike. Today and the next day(s), bus drivers in local and regional public transport are holding a so-called “relay strike”. This means that today they will go on strike in cities A and B and tomorrow in city C and D.
Today for instance some of the bus drivers in Almelo, Oldenzaal, Dedemsvaart, Zwolle and Helmond are on strike. Tomorrow it’s part of the bus drivers in Leiden and Lisse.
Use the public transport planner linked to in the OP to plan public transport journeys.