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If we now take the assumed hourly HFR service and deviate half of the services over the Bypass around Ottawa, our travel time between Toronto and Montreal decreases by the 15 minutes suggested by
@innsertnamehere, which may increase of the passenger volume between of 5.1%. However, the resulting doubling of the headway offered between Toronto&Ottawa and between Ottawa&Montreal, may
decrease the passenger volumes of these markets by 8.6% and 13.1%, respectively, thus resulting in an overall drop of passenger volume by 4.3%:
Now, one might argue that the Express trains should be offered
in addition to hourly service, but since that extra train could just as well operate via Ottawa (thus doubling the frequency offered for
all three markets), we have to compare this scenario with half-hourly service on the Toronto-Ottawa-Montreal corridor and this results very similar results, with bypassing Ottawa for a 15 minute travel time saving may increase passenger volume between Toronto and Montreal by 4.9%, but may decrease that between Toronto&Ottawa and between Ottawa&Montreal by 4.4% and 6.6%, respectively, thus resulting in an overall drop of passenger volume by 1.4%:
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And all of the above is without considering that adding the Ottawa bypass adds 146 km (From De Beaujeu to Smiths Falls via CP's Winchester Sub) to the HFR network length (ignoring the Montreal-Quebec branch), thus increasing the length of ROW to be built or upgraded (which is a major cost driver for capital costs) by one-quarter and that adding an hourly Express train to hourly Toronto-Ottawa-Montreal trains would almost double train-mileage (which is a major cost driver for operating costs):
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