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Sheppard Line 4 Subway Extension (Proposed)

Why would you interline the lowest-used portion of Line 1? That would be most unusual. I see no reason not to build it to allow for detours, but this isn't going to happen for regular operations.
I thought this was a good idea in the past.
However I think complexity leads to risks. It also incurs costs.
It is better and safer to use the interlining money to extend the line farther - maybe a couple of kms.
Back in the day, if we would have avoided that 3 platform Sheppard/Yonge station with track connection to Yonge line - how much farther West could this line have actually gone in Phase 1?
 
Back in the day, if we would have avoided that 3 platform Sheppard/Yonge station with track connection to Yonge line - how much farther West could this line have actually gone in Phase 1?
Meaning instead of trains going from the wye at Yonge to Sheppard, they would reach the line from Wilson Yard directly?
 
Back in the day, if we would have avoided that 3 platform Sheppard/Yonge station with track connection to Yonge line - how much farther West could this line have actually gone in Phase 1?

The track connection between the Yonge line and Sheppard is for non-revenue moves only. It was never meant to enable any kind of service interlining.

With Sheppard being a short stubway and having no yard on its own, that track connection lets the Sheppard trains enter the service in the morning, and go back to the yard in the evening.

If the Sheppard line gets extended west and eventually connects to the Wilson yard, then the opposite operation will become possible: some of the Yonge trains will take a shortcut from the Wilson yard via Sheppard in the morning, and then operate as southbound Yonge trains. And in the late evening, northbound Yonge trains leaving the service could use Sheppard as a shortcut to the Wilson yard.
 
SHEPPARD NO.1 😎
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