I'm looking at an Intercity Train ticket from Amsterdam to Brussels Midi, Monday, 17 June, about 8am on https://www.nsinternational.nl
I want to take the older, slower Intercity Train line because I've been told I can get off at Brussels Central for a few hours before reboarding and going on to Brussels Midi to catch my Eurostar in the afternoon. Also I understand that whatever time I purchase, since it's on the Intercity line, it will be honored on any of their trains that day (in case we aren't moving very fast that morning). Just wanted to double check before I purchase.
The price is E 50. for two people. Should I buy now or just get while I'm in Amsterdam that weekend? I understand there really isn't any big rush for this older train so is the price about the the same in advance as on the day?
Is all this correct? Thanks for any advice.