Why monorail instead of a subway?
A. Actually I think a subway is better than monorail. It has most of the advantages of monorail plus it is hidden underground. The view from a monorail is certainly better than tunnel walls, but that is not an important argument. The big problem is that the much higher cost of a subway makes monorail more effective except where there is a very high volume of ridership, such as in New York City or Tokyo.
