I rode the train with my friend who is from Takatsuki.
As soon as I had sat down the seat, Announcement said "We are sorry for annoying you by the delay of this train. This train is under cleaning.Please wait for departure until the cleaning finishes."
The friend said "Did someone throw up? Otherwise, authorities wouldn't clean that" with pointing the garbage seemed to be tissues.
It is because small tissues wouldn't annoy passengers while nausea not only smells bad to make passengers unpleasant but also has possibility to expand infection. I see.
