Heavy rail is for transport between municpalities and everybody has a bus system at least in Europe.

Well London for example has a lot of suburban heavy rail, it's not on this list of course because of the tube, but conventional rail fills in a lot of gaps that the tube doesn't cover and actually works well. You could sort of say the same for Leeds/Bradford, though probably not as good, it's in an area with a dense rail network which probably explains why light rail never took off there - I'm not from the area so I can't really say how well it works. I'm a big advocate for trams and light rail but there's no one-size-fits-all solution for all cities, cities with different geography, density, etc need different transport. That's why I said about quality in my other post, the overall quality of a city's public transport network should be judged, not just the modes of transport.