I'd be pleased to.
There are a number of asset classes, under the category of infrastructure, that exist today in Canada that have various models of revenue generation or user pay: electricity grids have tariffs; water has meters and user fees; property development has land value uplift capture that is possible on revenue; and various roads, including in my home province, use tolls to pay for infrastructure. There are various types of revenue attached to various asset classes of infrastructure in Canada. It's a wide-breadth definition of what constitutes revenue in each of those classes that already exist in Canada today. Also, of course, there are fare boxes on transit.