vegeta_skyline
Senior Member
The mainline would need to be shifted north and the clearances are very tight(depends on the required safty margin) but 3 tracks could fit in that tunnel. But thats irrelevant now as the plan has changed, as you've noted metrolinx has acknowledged the need for an additional tunnel under the 401 to accomedate 4 total tracks through the corridor. That wasn't originally mentioned in the old plans.I take the train everyday, to me it seems just two trains can fit side by side in that tunnel.
All the new bridges will be built to accommodate a total of 4 tracks in the corridor - widen bridges or new & old bridges combined, regardless of how many tracks will be in use/service on opening day.