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Originally Posted by acottawa
200 kph plus class 7 track would be classified as a high speed route, which is much more expensive proposition than the budget esimates.
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Upgrading all existing track to class 7 would be very expensive. For the roughly 150km of new track to be built between Havelock and Glen Tay, it would be more expensive than class 5 track, but probably worth the cost in the long run and would more likely be within the budget estimates.
My theory on this is that VIA hasn't given up on HSR, but instead is using HFR as a stepping stone towards it. History has shown that there hasn't been any appetite for the high cost of a full HSR but maybe something with a lower price tag could be achievable. Once built, upgrades could gradually be made to convert the line to HSR.
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The only 200 kph service in North America is the Acela Express, so you either have to wait until Amtrak is doing an order for new Acela trains or buy something custom (and custom as we've learned many times adds a lot of cost).
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But Amtrack is replacing the Acela Express trainsets with new
Avelia Liberty trainsets (made by Alstom). It is capable of a top speed of 220 miles per hour (350 km/h), with track and signalling upgrades, so they may not be what VIA is looking at.
Instead, VIA might be looking at the Siemens trainsets that Florida's
Brightline is having built. They will be used at a top speed of 125 miles per hour (201 km/h) and are currently in production (4 of 5 trainsets have been delivered and more will be required for Phase 2).
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Also, class 7 track requires more grade separations, fencing, etc. which adds more money.
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The abandoned part of the Havelock Subdivision is pretty remote, greatly reducing the number of grade separations needed compared to more densely populated areas, making it an ideal candidate for high speed. The distances between stations mean they can maintain the speed for longer, giving them a better bang for the buck.