Rainforest
Senior Member
There will be no split line.
If, against all projections, ECLRT hits its capacity limit, such condition will apply equally to the tunneled section and the surface section. Train frequency is just one of several parameters that determine the capacity limit. Design of the platforms, stairs / elevators etc matters, too. If one finds a way to run trains in the tunneled section much more frequently than what it was designed for, surely one of those other limitations will be hit.
The only viable solution would be to offload ECLRT using other lines. Extended Sheppard line can divert some of the load. If that's not enough, then a new Lawrence line.
If, against all projections, ECLRT hits its capacity limit, such condition will apply equally to the tunneled section and the surface section. Train frequency is just one of several parameters that determine the capacity limit. Design of the platforms, stairs / elevators etc matters, too. If one finds a way to run trains in the tunneled section much more frequently than what it was designed for, surely one of those other limitations will be hit.
The only viable solution would be to offload ECLRT using other lines. Extended Sheppard line can divert some of the load. If that's not enough, then a new Lawrence line.