Unless you reach an economic moment where you can pay the same to a policeman in Sweden and a policeman in Greece there is never going to be a socioeconomic identity that would allow you to aggregate all these people in some sort of federation police force. Same for rail, same for most anything where there is a cost or expense or transaction.
The diversity of systems reflects a diversity of arbitrage. Brute forcing that into a single entity or federal body is ivory tower thinking.
