I don't think there's any plans for all day both direction services outside REM. As for Pis-IX, there were so many accidents/deaths when v.1 was around. When they say "reserve lanes/ROW" they really mean it... Get out of the way or get hit by the bus...that thing is speeding for real...jaywalk at your own risks in Montreal
It's a shame, Montreal has an expansive commuter rail network... which has decayed and stagnated for decades. Toronto has built one from the ground up over the course of the last 50 years. If Quebec showed the same ambition with the AMT as Ontario showed with GO, it would be nothing short of transformative.
The Vaudreil-Hudson line is popular, despite its
very limited service and lack of reliability due to conflicts with CN. Personally, I would take it to work and home every day except there are only two trains in the evening that I could take, 3 hours apart. Same thing with Deux-Montagnes, limited service has resulted in stagnating ridership.
The REM proposal is good in the sense that it provides metro service where before there was just commuter rail. But it has a number of flaws.
1) It's basically throwing in the towel for the AMT and saying that Skytrain is the future of transit in the region. This could be considered good or bad, but I question whether Skytrain will do well in the very snowy climate here. It also means that all the sunk costs with electrification and rolling stock has been wasted. Skytrain is very cheap for establishing new lines (I think it's great for the South Shore portion of the route, especially since the
new Champlain bridge has been under-designed so only Skytrain would be light enough to use it), but I don't know if it's a good choice for replacing existing lines. The current route cuts off the Train de L'Est by monopolizing the Mont Royal tunnel, and dooms the St. Jerome line to its current circuitous and indirect route, which threatens both their viabilities.
2) The ownership model of REM is not great. Basically the city/province is handing over an invaluable asset, the Mont Royal tunnel, and the most profitable AMT line and giving it to a private pension fund. Fares will have to be high to make it profitable, which makes its ridership suspect. And the success of the line depends entirely on connections to existing, publicly built infrastructure, and on publicly funded local feeder buses.
3) The route is not good, and has been presented as fait-accompli. The route seems like it was designed to check boxes off a list (Airport, West Island, downtown), not based on what makes the most sense. The A40 section is the most expensive part and also is projected to have the lowest ridership (
according to analysis done by bloggers, since the Caisse has refused to reveal its ridership projections for each section). Most of what is serviced is unpopulated areas around highways and parking lots (Park and ride model). There is an imbalance between the three branches in the west and one branch in the east. It's also a dumb way to reach the airport, involving kilometers of tunnelling when the airport is only 400 m from an active commuter rail line.
4)
There is a capacity shortfall. According to an analysis done by bloggers, even though there is a large capacity increase during the day from the all day service, during rush hour the train could not replace all the commuter trains it is supposed to in addition to handle its expected new ridership. These are Vancouver-sized trains replacing commuter trains. And how are these trains supposed to handle the transfer volumes when trains several times their size unload north of Mont Royal and expect to be able to transfer?