Scarborough Subway Extension
Like the Ontario Line, the Scarborough Extension has been split into two pieces. The first will be the tunnel contract from Kennedy Station to McCowan. This is now in the procurement phase, and financial close is projected for Spring 2021.
The remainder of the project previously had a projected closing date of “Winter/Spring 2023”, but this is now just “2023”. With the tunnel hived off into a separate contract, it is reasonable that the remainder would have a later start date because the tunnel is a key component that must be in place first.
Metrolinx recently published a Preliminary Business Case for this extension. It includes the following text:
Kennedy Station Pocket Track/Transition Section
The Kennedy transition section extends roughly 550 metres from the east side of the GO Transit Stouffville rail corridor to Commonwealth Avenue and will include special track work and a pocket track to enable every second subway train to short turn to suit ridership demand and minimize fleet requirements, as well as lower operating costs. [p 24]
This turnback has been an on-again, off-again part of the project but it is now clearly included as a cost saving measure. With only every second train running to Sheppard/McCowan, the fleet required (as well as storage) would be within the system’s current capacity. This ties in with the timing of the T1 fleet replacement on Line 2 as there are enough T1s to run alternate, but not full service to Sheppard. This would be similar to the arrangement now used on the TYSSE where only half of the AM peak service runs north of Glencairn Station to Vaughan.