GO Trains are back from Stratford to K/W and into Toronto.
https://www.ctvnews.ca/kitchener/article/go-train-service-extending-to-stratford/
There is no way that we want a GO Train back in London that takes 4 hours to go to Union Station and has 1 departure per day, but if they can figure out a way to get those trains faster, even to Stratford and K/W from London, it would be great.