Originally Posted by MisterNice
Forget Thalays and take the regular international trains. Cheaper, more flexable (ie no reservations) and more trains. It will be slightly longer though.
This would be correct for a trip from Amsterdam to Brussels. Especially since the "high-speed" Thalys runs at normal speed between those 2 cities.
But for Brussels - Paris don't hesitate, go for Thalys. I'm not even sure that there still are normal trains; as far as I know the only choice between BRU en PAR is Thalys. And in that case it's easier to start on Thalys from AMS (without changing trains in Brussels) ...