Apparently the NMBS/SNCB website now makes a difference between “Brussels-Midi” and “Brussels-Midi Eurostar”; same station, different track.
Due to this change, iRail was no longer able to provide any scheduling information which included Brussels-Midi.
I’ve made a quick and dirty work around (by including “+ Eurostar” in the drop down menu), solving this bug.
However, please, NMBS/SNCB, please please please provide an API or report such changes to web developers.
As it is now, if you manually fill in Brussels-Midi and do not add the Eurostar text, the iRail website will not be able to to look up the requested information.
Thanks to Stéphane for the bug report.
Fixed to work with “Brussel Zuid” and “Bruxelles Midi” again. No need to add the Eurostar bit.