One enterprising group of passengers proposes a counter protest. From this site you can download a fake ticket to hand over to your conductor next time you travel by train to indicate your disapproval of yesterday's action. It's of course rather unfair to take out one's feelings on the train staff, when the real problem is clearly one of corporate culture overall; I don't even particularly blame the unions who are just playing the game according to the usual script. But this seems to me a harmless and sane response.
(For a satirical take on the recent public sector strike in another EU state see here.)