Into service - not really. There is very little issue with inserting an additional train into the current service stream.
Out of service? Again, not really. Trains running out of service at peak times will turn to the west, run to the centre track west of Chester, then turn back east to run to the yard at Greenwood.
By the way, at one point they were talking about storing the unneeded trains at mid-day in the tail tracks past the terminals. I suspect that they are still planning on that. That would minimize or eliminate all deadhead moves on the B-D during the busiest part of its service.
I can't see them building a crossover east of Pape Station to allow trains to crossover there, but even if they did they wouldn't use it until the headways were wider after the rush - especially considering the fiasco that's been going on with the north end of the University Line over the past 4+ months.
Dan
Toronto, Ont.