Monday 13 may - disaster averted
Franch trains are placed two in a row per platform. And there is no information which train is going to which destination.... I got on the wrong one, together with lots of French people who were talking to me and when I answered in English they just turned away without another glance. But all seemed unsure, and finally one girl came and said "Epinal? No." And so the train emptied and I followed. With minutes to spare I change trains and I should be on the right one now. I think.