BurlOak
Senior Member
The last estimate I read was around $1B. I believe that included a substantial overhaul of the smoke ventillation systems (like Finch got: $6.5M per station) due to the doors changing the airflow patterns, asbestos removal at some stations, and signal system on Bloor/Danforth.
If the airflow is a concern, partial height screen doors may not have the same problem. Alternatively, breathable screens could be used - I am thinking chain link fence, but I am sure there is something similar that still has reasonable apprearance.
Even at that, I say I would rather spend the money on expanding the transit system.
Although they are different operators, why is screen doors on GO not being talked about.