BMO
Senior Member
From the TTC:
"The TTC’s Wilson Yard is undergoing a significant expansion of the rail yard and supporting maintenance facilities. The expansions are required to accommodate the needs for Toronto Rocket (TR) train storage and as a result of the introduction of the Toronto-York Spadina Subway Extension (TYSSE) and increasing service demands on Line 1 (Yonge University Spadina)."
Basically what's happening is that we need extra space in the yard to accommodate additional trainsets that will be operating on Line 1. These additional trainsets are needed because of the TYSSE, and because Automatic Train Operation (ATO) will allow more trains to operate on Line 1, increasing line capacity.
Cheers, thanks for the info!