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I do understand the list of things required for the SSE, but one question about one item. Why is ATC required for the SSE? Couldn't they just run trains (aside from the fact they need more), without it? What's the technical explanation?
The desire is to convert all of Line 2 to ATC. That's in the TTC capital plan.
Cost assumptions for the SSE assume only ATC signalling; not putting old school block signalling in and later paying to replace it w/ATC.
But if the extension is ATC then the rolling stock must have ATC as well. The existing Line 2 rolling stock (T1s) do not have ATC on board.
This means either replacement rolling stock OR a retrofit. Currently the budget shows plans for a life extension for the T1s instead of new rollingstock, but does not appear to have money for an ATC retrofit.
This seems rather contradictory and at cross-purposes to other budget items.
Further, the current plan is for the Relief Line rolling stock to use ATC and to navigate their way to Greenwood via Line 2; that requires that section of Line 2 to have ATC.
You see where this all gets rather messy!
Steve Munro discusses this in some detail, here:
TTC 2019 Fleet and Capacity Plans Part I: Subway (Updated)
Note: At the time of publication (Noon on Monday, March 18, 2019), I await a response from the TTC to several questions on issues raised in this article. When the responses arrive, I will update th…
stevemunro.ca