"I've ridden rail/subways around the US and the world" -PoiDoggy, 

NOPE....I can name many Mass Transit Systems that actually work (are rated in the top 10 Internationally) that I have used while living at those Nations (Stationed at as a U.S. Military Officer) and all have Public Restrooms, 

So nope you have NOT ridden rail/subways around the World, maybe only eaten at Subway sandwich shops sure.