It highly varies depending on POV, but for the railways the worse could be people piling up in stations with no idea if they'll ever get a train, and people piled up in trains, with no idea when they'll ever be able to get off.

Sure stopping all trains must be burning a crazy amount of money, but the above scenario would be burning the same amount of money (I assume they have refund policies or they'd be operating with no ticketing), employee sanity, and urgent care for anything that could happen during that time.

I have faith in Dutch people's kindness, the same happening in Paris would be riots and physical danger for the staff if they kept the trains running.