(Source: Mu-san Railway Diary)

Nothing wrong, except back then none of passenger cars, even these first-class panorama cars, were not fitted with a sewage tank. They had toilets and the, eh, wasteful material was simply flushed out onto the rail. The comptemprary wisdom was that the stuff would be left behind or dispersed onto the paddy fields nearby, which needed organic material anyway. So the train toilet had a caution which says "Do not use when the train is not running" for obvious reasons.

However, it was later discovered that, as the train speed became higher, the things would not just go away, instead they would become small particles and moisture which could be blown back into the train through open windows. Worse still, long-distance trains had a restaurant car but no air conditioning. So if you opened a window on a hot summer day on the restaurant car those days, the chances were that you were not well served.

Thank you for bearing with me to start a new year with a topic like this. (It's DoDo's fault.)

I will become a patissier, God willing.