I think that's only to provide service into Galt (Cambridge) from Guelph and the Kitchener line, rather than using the more direct Milton line.There is a proposal to use the Fergus sub to provide this kind of service.
Theoretically, you could take a train from Union that's arrived from Milton, then run it back to Guelph, down the the Fergus sub, change to the CP at the Waterloo sub, and onto the Galt sub eastbound to another (latish) peak run.The Fergus Sub has nothing to do with service to the east of Milton and in to downtown Toronto. That's where the restriction lies.
But it wouldn't provide counter-peak service along the Milton line, which is what the question was about. Or be very pragmatic or useful I'd think.
Rounding.How can there be a 0% transit share when people already use the existing GO trains to travel between Kitchener and Guelph?
1% would be 300 (or 150 to 449 people).
0% would be 0 to 149 people.
Which isn't surprising. Pre-Covid (September 2019) the last eastbound train from Kitchener to Guelph during AM rush arrived in Guelph at 8:20 AM, while the first westbound in PM peak was at 5:12 pm. I'd think the number of people that this would for would be small (but more than 0). And this was only a relatively recent development.
But I'd think the bigger demand would be commuting to Kitchener from Guelph - which remained impossible with the first GO Train departing westbound from Guelph at 2:22 pm.