I honestly don’t know what the business case for having any Montreal-Toronto Express trains bypass Ottawa via the Winchester Sub is supposed to be, as it would significantly increase capital (25% more route-km to upgrade) and operating costs (94% more train-miles) for an insignificant increase of ridership (3.3%, according to my GJT model)...
Besides, you are totally missing my point. I was trying to say that having completely separate and isolated ROWs for Montreal-Toronto and Ottawa-Toronto (like some people seem to be promoting), is not only expensive, but unnecessary since the shortest possible route for Montreal-Toronto could have branches to Ottawa and Kingston with the bulk of the ROW being shared.
If you go back to my original post, you will see that I said,:
No, you are "totally missing" my point: I'm not saying that there is no economic case to build the Ottawa bypass from the outset, I'm saying that it's not worth building at all.
To explain this, let's look at an actual real-world example of the
Bremen Freight Bypass:
Bremen Freight Bypass [...]
When the
Hamburg-Venlo railway was built, the
Hanseatic city of Bremen (like Hamburg) was still not a member of the
German Customs Union (
Zollverein); in fact this did not happen until 1888.
In order to be able to transport goods from the Rhenish-Westphalian industrial region to Harburg
[Note: Harburg is a suburb of Hamburg] without incurring taxes in the German customs area a treaty-approved goods line was built due east past Bremen which also reduced the journey time considerably because it was almost 13 km
[Note: more like 34 km, the bypass itself is just short of 13 km] shorter than the main route which ran in a loop through Bremen state territory.
[...] The shortcut was worked for several years by the Hamburg–Cologne Metropolitan line. Currently an ICE Sprinter pair of trains uses the line to circumvent Bremen Hbf. Tracks pass over the Friedenstunnel in Bremen.
Basically, an 11.7 km long bypass (from Sagehorn to Bremen-Gabelung) avoids a 45.6 km long trip through Bremen (
Germany's 11th-largest city and smallest city-State with just over 500k people), thus shaving 33.9 km off the route or 2.9 km for every km bypass built:
Adapted from:
DB Netz Register of Inftastructure
Note that out of
21 intercity (IC/EC/ICE) trains running daily between Cologne and Hamburg, only 6 make use of this bypass, whereas 15 trains (i.e. one per hour) use the regular (longer) line to serve Bremen Central Station:
Source:
Fernbahn.de
Consequently, the Bypass line is unlikely to be upgraded beyond its current speed limit of 100 km/h (even though the regular line is capable of 120-200 km/h), as even at an assumed average speed of 160 km/h on the regular line (a unrealistically high estimate!), an average speed of 100 km/h on the bypass route would save exactly 10 minutes, whereas even an upgrade to 300 km/h (the fastest speed of any train reached in Germany while in revenue service) would fail to save another 5 minutes):
Note: speed figures highlighted in red means that the average speed required to achieve the desired travel time saving exceeds the average speed assumed for the regular route.
Now, let's look at the Ottawa bypass and assume an average speed of 120 km/h (i.e. roughly the average speed implied by the latest travel times we've seen for HFR) for the segment you want to bypass (i.e. De Beaujeu to Smiths Falls): This time, the regular route is 214 km and the bypass route is 146 km, meaning that the bypass would save 68 km or about 450 meter for every kilometer of Bypass built. Note that the bypass is 12 times longer than the Bremen Freight Bypass, but shaves only twice as much of distance off the route. Note also that upgrading the Winchester subdivision to HFR standards means building new tracks and passing loops, whereas the existing route via Ottawa is already mostly straight and requires very minor upgrades for HFR. Anyways, let's still assume we would build that bypass and chose an average speed so that it saved 30 minutes of travel time (i.e. at 113.8 km/h, see table below), every subsequent upgrade on the Ottawa route would reduce that travel time advantage and would eventually make the whole bypass redundant once the average speed on the "regular route" exceeds 160 km/h (i.e. an increase of only one-third compared to HFR speeds).
Note: as in the last table, the speed figures highlighted in red means that the average speed required to achieve the desired travel time saving exceeds the average speed assumed for the regular route.
In the end, the fact that the incremental costs to upgrade an alignment raise exponentially with the design speed, it is clear that the bypass would never be upgraded to HSR standards and that's the point where even you should realize that it would be a costly mistake to ever build it...
In other words, this would only happen once when demand has increased to a point where HFR is exceeding its capacity and upgrades are needed anyway. The thing about intercity rail is once you have hourly service, increasing frequency beyond that doesn't provide significant benefit, so rather than having 30 minute service through Ottawa, it would make more sense to keep it at the (post HFR) hourly frequency and add hourly express trains from Montreal to Toronto.
This is complete nonsense:
the GJT model shows that a decrease in headway from 60 to 30 is equivalent to a reduction of travel time by 13 minutes (i.e. the perceived penalty decreases from 39 to 26 minutes). Therefore, having that second hourly train stop in Ottawa has the same effect to demand for Ottawa-Montreal and Ottawa-Toronto than upgrading the lines to shave off 13 minutes on
both sides of Ottawa. This extra demand might not matter for stations like Kingston or Peterborough, but in the case of Ottawa, it would be huge...
I'm always happy to lay down why bypassing Ottawa would be extremely wasteful in terms of capital and operating costs, but I do start to wonder what still remains to be explained...