we will need a relief line for the relief line.
That was the whole idea around Smarttrack, but it will only offer even limited relief if the fare is the same as TTC, its free to transfer from TTC to it and vice versa, and there are frequencies as good as every 5 minutes during rush hour.
Unfortunately I dont see GO RER/Electrification being done until 2025 at the earliest as well.
However I do think that the $3 GO flat fare for inside of Torontos borders would help even now. The problem is they will have to increase GO train frequency inside of the Toronto area to compensate and im not sure how many more trains they can squeeze on the existing service right now. The 16 new GO train engines they bought can carry 14 car trains, so maybe that will help.
The other things that will help relief in the meantime is Automatic Train Control on Line 1, due to be done at the end of next year. What this will do is allow for 33% more trains on line 1, running every 30 seconds! At rush hour.
I think some more express bus services will be needed as well in the interim, with large bendy buses offering nonstop rides between key stations.
Finally, and I know people hate this, but time based fares would help. If you offer people a discount for riding outside of rush hour, there are those who will definitely do it. I think politically this has to be massaged quite well. What they could do is after the next fare raise, lower fares outside of rush hour. Raising fares just for rush hour would be political suicide. Thats your voting demographic right there. So you make it look like an equal fare raise, and then after a year you advertise lower fares outside of rush hour.
These are all things that can be done before the Relief Line is ready, but they bring their own problem: political projects are usually in response to a bad situation. The squeaky wheel gets the grease. Things dont get done until the problem has become so bad it becomes a voter issue. If you continue to remedy the problem with bandaid solutions, you delay when the problem becomes so bad that politicians MUST act. So by creating a "relief line for the relief line", you cause the issue to be deferred to a later and later date, and allow politicians to stretch out the date when the relief line is ready.