This picture was taken during the construction of the Bloor Street viaduct (a.k.a. the Prince Edward Viaduct) on March 10, 1917. RC Harris, one of Toronto’s great forward-thinking city-builders, insisted a subway track be constructed, even though no subway would run on those tracks for decades to come. His water filtration work saved the lives of hundreds of his contemporaries (and much of it is still in place today).
via Flickr http://flic.kr/p/s6n4Hb