The bolded is incorrect because of deadhead time and conflicts with Line 1 traffic.
The existing 4-car, Line 4 trains are already serviced at Wilson, they simply aren't stored there because of the deadhead/capacity issues. It takes about an hour to get a train from Wilson yard to Line 4, each direction.
That conflict is actually marginally increased by longer train lengths which mean more physical space being occupied by deadheading trains.
This isn't just operator time, or electricity costs, though it is both of those; its about the ability to start up and ramp down Line 1 service, and the overnight maintenance window for tracks/tunnels which is already quite small.
The space is the new yard is to support new trains required for Line 1, that's why there isn't any room for trains from Line 4.
So when Line 4 is extended east, what's stopping them from using the new Yonge north yard to store the Line 4 trains? Move the Line 1 trains to Wilson instead. There's plenty of space in Wilson to accommodate the entire fleet of Line 1 trains.
There's also Greenwood yard that could be dedicated to Line 4 trains.
Please see below for why you think the Sheppard west extension should be made.That simply isn't a case I've made, at all, ever. Please read what I have posted, carefully.
The primary case for Sheppard West is connecting Line 4 to Wilson Yard to provide easier, less time consuming deadhead movements and potentially avoid the cost of building a new yard for Sheppard East.
Serving passengers is more incidental to that since the tunnel would be there anyway;
Incidentally serving passengers is the wrong way to do public works project planning.
Question, will there be more demand for the Finch east extension to Yonge station, or Sheppard west extension to Sheppard west station? Bear in mind one costs $2.8 billion and the other costs $0.72 billion.
I was being VERY conservative.
Here is the capital budget line item for the new Obico yard for Line 2:
And the line is right there, more or less.
By comparison, the only place an eastern yard is going is CP's existing Toronto Yard. Assuming CP agreed to sell some or all of that yard to TTC, the connecting track would be significant back to Sheppard.
The Obico yard is humongous. Rivalling the Wilson yard in size. Enough to service Line 2 with it's Scarborough extension with tons of space left. You would need less than a third of that to service just Sheppard with it's extensions. Your $1 billion would be more in line with the requirements of Line 4 with its extension.
Incidentally, in the document you linked, there's no mention of requiring a western extension Line 4 to alleviate deadheading issues you keep bringing up. Why doesn't TTC think it's a big enough problem to be addressed?
You keep using the word 'arguing'.
I am simply putting forward the facts. Not because I desperately want to build this, I'm not part of a pro-Sheppard extension movement.
I just find the case for Finch as an alternative to Sheppard unconvincing in light of the facts.
Stating something as fact didn't make it so.