Distance by car is 1:45 hours. Connection by train will bring you to either Venray (Oostrum Station) or Boxmeer, but you need a costly cab drive to get to the museum from there. Therefore, it is advisable to rent a car. From Amsterdam, you take the following highways: A2 to exit Tiel/Nijmegen/Gorinchem (highway A15, Tiel direction), and then to exit Zwolle/Eindhoven (highway A50, Eindhoven direction). From there on follow Venlo, which will bring you in about 15 minutes to highway A73. Exit 7 is the Overloon exit.
Hope this will help you out. It might sound rather complex but it is really just highway all the way from Amsterdam to Overloon.
Erik van den Dungen
Krijg snel antwoord van medewerkers en voormalige gasten van Oorlogsmuseum.