1. Queen Street Subway: It was first proposed in 1911, and we've been talking about it ever since. The closest it's come to fruition was as part of original Toronto's 1940s subway plan (which saw the construction of the Yonge Line). This one would have been an underground streetcar line, emerging to the street further out (which, while not ideal is sure better than our current nothing).
3. Eaton's College Park Tower: What would have been an imposing, 200m+ skyscraper above an enormous department store was also killed by the Depression. Only one quarter of the proposed podium was ultimately built, and that alone is quite grand:
https://www.blogto.com/upload/2013/0...ollegePark.jpg
3. Vimy Circle: Cancelled due to the Depression.
4. Harbour City: a futuristic "floating" city of the 1960s, that would have housed 60,000 people on the Islands. It had the backing of planners and urbanists like Jane Jacobs, but was killed by the newly elected provincial government.
5. GO-ALRT: A 1980s proposal for high-speed automated commuter trains to replace the diesel trains of the Lakeshore line that stretches from Hamilton to Oshawa, plus another branch to connect the airport and suburban city centres. It was cancelled due to government budget cuts - and now 40 years later we're only just now getting back to upgrading to higher-frequency, electrified regional commuter rail service.