It's a treasure trove of data to know the bathroom utilization rate normalized for passenger volume and time spent per session. Maybe train bathrooms are highly unoptimized. Do trains which frequent downtown areas with bars and sports stadiums need more bathrooms? Maybe there is some kind of flex use option for low passenger count trains to make use of that space but also provide a buffer for commute hours? Does the speed/acceleration/jerk of the train impact bathroom habits? Could this be used as an early warning system for possible food poisoning outbreaks? How can all of this be factored into ads we can serve the bathroom user?