One of the biggest weaknesses in our current subway is that to if you don't live centrally in downtown Boston, you have to go into downtown to take a line that then goes west/north/south. Our lines need more connections at the outer points of the map. If you go to Tokyo,JP, one of the great things about their subways is that the map is more like a spider web. Rather than just spokes that all lead into Tokyo, they have ways to connect so you can avoid going to the central hub just to go back out.