Based on
this post by
@reaperexpress it appears it was mentioned by Phil in his interview with
@Reecemartin. May have been mentioned in other videos.
There was also this Steve Munro post:
As part of the GO Expansion plan, Metrolinx had intended to grade separate the junction at Scarborough Station on the Lakeshore East corridor to eliminate the conflict between frequent service on t…
stevemunro.ca
This post includes a reasponse from Metrolinx to Steve.
Both of these links were discussed at the time here, but there might be some new members here who didn't see them.