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GodricKharg
That seems incredibly unlikely. For one thing, I don't think it's a lawsuit, but rather a fine enforced by law (even if it's a private rail company, disrupting the running of the trains is a big fucking deal, the families of people who commit suicide by jumping in front of a train are regularly forced to pay large fines to the rail companies). Secondly, the train company has no reason to fear publicity for something like this. This is probably something that happens frequently—idiot drivers or pedestrians get in the way and make the trains use their emergency break. It doesn't matter to them who the cause of the disturbance was, the whole point is that every time the train is forced to make an unscheduled stop, passengers are forced to wait, the company is forced to publicly apologize, and all of this costs them money. Doesn't matter to them if she's a famous novelist.
Maybe the publisher would cover her fine, but I don't really see why they would. Unlike some of the other shit she's got tangled up in, this has absolutely nothing to do with the publisher. I could see them paying for damages related to her action at the award ceremony, but that's a completely different situation.
And there's also Hibiki's character to consider. I'd be shocked if she ever told another living soul why she decided to stand on the tracks. She's never going to tell anyone she saved that guy's life.