I am inserting a little sidebar into the discussion because my archives yielded up an exhibit not included in the TTC’s report.
This is the demand analysis shown in Chapter 2 which establishes the “need” for additional capacity on the Yonge line, specfically at Bloor-Yonge Station.
This is the companion chart from the Network 2011 study showing the projected demand on the rapid transit network with the addition of lines on Eglinton West, Sheppard, the DRL and the Spadina/Harbourfront line.
These two charts appear side by side in the Network 2011 study, but only the first one was included in the Improved Headway Study.
The DRL diverts a good chunk of traffic off of the Yonge line below Bloor, although this is partly backfilled by new riding pouring in at the top of the line. (Other studies had different versions of this line including routes that went further north.)
The projected demand on the Spadina line, 7,500 per hour, was rather high considering it was to be a surface operation crossing many streets. Oddly enough, only the Harbourfront portion was built initially, and we waited until 1997 for the Spadina streetcar.
I don’t intend this to be a definitive example of a demand model (I don’t think “definitive” is a word one can use in that context anyhow), but it points out how the importance of the DRL was recognized over 20 years ago. Indeed, in the Network 2011 plan, it was the second priority for construction with 1st place going to a Sheppard line only as far east as Victoria Park.