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Originally Posted by ssiguy
Yes I do know the difference between the powering of DMU and EMU and interesting as I never knew there were commuter rails with 3rd rail. When you get that kind of thing I guess service frequency becomes more of an issue as to what it is characterized by.
I think, for those corridors in Toronto itself, a catenary subway would be better for the TTC than an EMU. Not only would people view it more as a subway but also they are superior for faster loading/unloading of passengers. This will be a fewer stop subway system but still will have more stops than GO and not all the trips are going to be that long with some being only a few km.
It would be probably easier to have them as catenary subways as Toronto doesn't currently have any EMU so would require fewer large and completely separate maintenance and control. Building a connection to one of the current yards with catenary and tracks would still be cheaper than building a whole new subway main/garage and finding the land to do it.
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Just to clarify, EMUs use overhead electrification as well - most modern passenger trains are EMUs, even TGVs etc. The Eurostar had something like 3 or 4 different power systems, including 3rd rail, and Thameslink and RER trains are capable of running on both 3rd rail and OHLE also.
I don't think calling the Go lines subway is very accurate - metro maybe but subway definitely implies underground. A new brand name would be useful, similar to Paris' RER, German S-Bahns and London's Crossrail. The strategy with the lines is definitely going in the right direction though.