The Platform Pis in Marseille states when trains arrive into Marseille, and when they arrive the platform pis changes to when they depart. Is this accurate to real life or is it a bug? they also states they’re outward bound destination for when they are due into Marseille
I don't know how it is in France but in UK stations arrival boards generally state where the train has come from - which usually is where it's going to head back to, especially on an intercity service like the TGV. So presuming France uses the same logic as us, yes, it's probably accurate.
