It's a matter of population and density, imho. Toronto has mostly low-density housing, with spots of very high density- generally, around subway stations. From

It's a matter of population and density, imho. Toronto has mostly low-density housing, with spots of very high density- generally, around subway stations. From a plane the other day, I noticed you can see all the subway lines from a very far distance just by looking for lines made of tall building clusters. This is a feedback relationship though- where there is density, we put subway lines, and where there are subway stations people build more density. London, by contrast, has more of a medium-density everywhere. You could put a tube station just about anywhere in London and you'd have a large number of people who can and would walk to it. Still, I'm quite happy with the quality of the lines we do have. I just hope that as we build more, that can be maintained.