Yeah, that doesn't make sense to me either. When it comes to the DRL, I don't have full trust in what Mr Munro writes. Sometimes it seems he has a bit of a bias, or is kinda closed-minded on the topic.
And I didn't see them posted, but here's a couple screenshots of Metrolinx's DRL-Long and LRT routes. To make it easier for people to look up instead of opening up the pdf.
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If anything, I'd expect RL LONG to result in significantly greater fleet costs.
If I've understood correctly, a problem with YRNS and the other studies so far is that they treat current YUS ridership figures as if those figures represent everyone that wants to use the line. The YUS is over capacity, so presumably there are a significant subset of commuters who would take the YUS if they were able to fit on the trains.
All the YRNS tells us is that of 31,200 pphpd using the YUS today, 11,600 of them would be diverted to DRL LONG (this brings YUS usage to down to 20,700). It gives us no indication at all of how many new riders we can expect to fill the 15,300 pphpd of available YUS capacity that will be made available because of LONG.
Obviously, this has very serious implications for fleet requirements. Say that 5,000 new riders are generated on YUS because of the capacity freed up by LONG - this would mean that the YUS fleet would have to be 25% larger than indicated in YRNS. Hopefully the next stage of the study will examine how many new YUS riders will be generated on YUS because of LONG.
Of course, greater fleet costs wouldn't be a knock against LONG. It just means we're converting more commuters to transit.
Tangent: I am really curious to see how LONG will affect Toronto's modal share. The share is now being limited by the lack of transit capacity on our surface and RT routes. LONG would open up more of this capacity than any other transit proposal we've seen.