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So why is this train (Stadler Flirt EMU) so quiet? And the Alstom-CAF Régiolis Paris - Nuits-sous-Ravières so noisy?

On modern trains with lots of doors, the door design especially at the bottom of doors, is crucial. Stadler doors have these little hooks that secure them at the bottom. Less vibration, less movement when pressure changes. So a quieter ride!