Steve Munro last month had a great post researching the history of TTC service in 1928, drawing from all kinds of sources to come up with a detailed profile of the service.

Much more is at Munro's site.

A recent comment sent me looking for service levels early in the TTC’s existence (post 1921), and I was pleasantly surprised to rediscover that this information is in a book, now long out-of-print, by John F. Bromley called TTC ’28. This book provides a view of the system when the electric street railway in Toronto was at its height.
In a recent presentation to the TTC Board, staff argued that the streetcars were an integral part of the growth of Toronto, but their viewpoint was comparatively recent, from the 1950s onward, and even that did not fully show the former extent of the transit network which was once almost entirely operated with streetcars.
I often get questions about the streetcar system as it was, and this article is intended to consolidate the bits and pieces in one place. The route histories will give some indication of why there is so much streetcar track in apparently odd places today. Remember also that the downtown one-way streets date from the 1950s when the DVP/Gardiner recruited several streets as on/off ramps to the expressway network and “optimised” them for use by motorists.
Information for 1928 is taken mainly from Bromley’s book. Other sources are Rails From The Junction by James V. Salmon, Riding the Radials by Robert M. Stamp, and The Toronto Trolley Car Story by Louis H. Pursley.
Much more is at Munro's site.