A rather lovely (and somewhat prescient) figure from a report prepared by the New York engineering firm of Jacobs & Davies for the City of Toronto in 1910. It shows plans for a system of “subway streetcars” – a combination of at-grade and subterranean routes – both ahead of its time and prohibitively expensive, especially for a modest city like Toronto at the time (which had a population of just 350,000). 

Source: levyrapidtransit.ca via @bgilliard