(01-16-2018, 11:29 PM)DHLawrence Wrote: I imagine a new Guelph Sub bridge will be needed when double-tracking or high-speed rail is introduced (whichever occurs first).
Based on the plan posted by @Markster at http://www.waterlooregionconnected.com/showthread.php?tid=225&pid=8675#pid8675, (large view: http://www.waterlooregionconnected.com/a...hp?aid=242), I would expect them to just be adding portals under the existing track.
This could be done using the 'bridge slide' method, pre-constructing them off to the side and then pushing them into place hydraulically in a one-day operation that minimizes disruption to the line. That's how Metrolinx replaced the West Toronto Diamond:
...K