Another random thought that keeps popping up for me, is after seeing stuff on YouTube about the
Winter Park Express in Colorado, is if there would be any public interest in a limited extension of the Milton line (once it has 2 way all day service) to the Glen Eden ski area. Given it already has the CP line running right beside it's parking lot, and it's less than 8k's away from the Milton station, it would hopefully not be a contractual nightmare to get a handful of paths to run 1 or 2 trains in the morning to there in the morning, and 1 or 2 trains from there in the afternoon.
Could potentially update the Niagara specific bike coaches to be used for Skis / Snowboards in their 'off' season, and provide a way for car-free Toronto residents to get to the snow.
I'm sure a simple single platform station would still be very expensive, but if we didn't overbuild or gold plate it, it may be doable given the infra that is already there.