The Bloor Street Viaduct and The Parkdale Connenction
The original building at 289 Sorauren was sold to the TTC in 1947 to be used as a maintenance facility. It was later used as a studio for film and television productions before being demolished. Sorauren Park is there now.
Below, one of the massive steel spans being assembled at the plant. The houses on Sorauren can be seen in the background.
Below, an interior shot when it belonged to the TTC.
I suspect that the trusses were built and pre-assembled at the factory on Sorauren. They were then taken apart and loaded onto a spur rail line that ran inside the facility and transported east to the site where they were installed.