China is unmovable by vehicle at all such that their failure of a mass transit system is trying busses on stilts.
Japan is tiny. I mean very tiny minuscule area of land.
Most of EU has no such thing. You are assuming it EU is Germany, France, and Belgium. PS, all the actual Countries (which EU isn't one) in the EU are tiny.
Size is a factor in cost and that is the real reason most Countries have no such thing as viable mass transit for the majority of their citizens. Paving sold cars and cars made corporations lots of money. Mass transit does the opposite and is thus objected to by same corpos.