Thanatos spends a lot of time in the quiet carriage because it's the closest he has to something the Underworld, and he shifts between places on the train. Not much opportunity to hear it unless he does so on purpose. No matter how vaguely familiar the Void seems to Thanatos, he avoids it more than others are able to.
"Thank you. Let us know if there is anything we can do from our end."
no subject
"Thank you. Let us know if there is anything we can do from our end."