How much data do you need in these countries and for how long? It's hard to give suggestions without knowing that :P
For The Netherlands you'll most likely be interested in Aldi Talk - €8 for 250MB or €20 for 750MB, these work on the best network of The Netherlands (KPN), however they are capped (at 200kb/s if I remember correctly).
If you'd only be in big cities (Amsterdam) you could well go with the cheaper T-mobile which gives you 1GB for €15. However this isn't usable on a train from my experience.
If you'd like me to help arrange a sim card for you in The Netherlands, just send a PM
I don't have any experience with French Orange simcards themselves, but I can tell you that using internet on the train is very doable in most European countries as long as you don't count on full 3G coverage - I travel by train a great lot though Europe with prepaid sim cards so I have some experience with this :P Orange is the best network in France as far as I know so I think you'll be set with that.