We're taking the train from Brussels airport to Midi to take Thayls to Gare du Nord. Once we arrive at Midi, how much time should we allow to clear security, get to the platform, etc.? Would welcome any other tips for BRU to Midi or Midi to GdN. Thanks.
Unless things have changed very recently there is no security check to board a Thalys at Brussels.
If I were not familiar with Brussel Zuid/Bruxelles Midi I'd allow maybe 15 minutes. Gives you time to pick up some Belgian choccies on the way too.
The departure boards are easy to understand and easy to find. Just ride the escalator up to your platform and hop on. You might want to know which carriage your reservation is in and stand in that marked area on the platform.
This is very helpful. Thanks.