Analysis of Route 512 St. Clair — Part 3: When Things Go Wrong

In this, the final installment of the St. Clair analysis, I will look at the problem of short turning, as well as the details of operations on some days when service was disrupted. 

Previous installments included full-month charts of headway and link time behaviour.  To start off here, the chart linked below shows the destinations and spacings of cars westbound from Yonge Street.  As in previous route analyses, the spacing between the vertical bars allows quick identification of headway irregularities, and the length of the bars shows how far the cars actually went on the line.

Westbound Destinations from Yonge

A few caveats in reading the charts:

  • Only cars (and buses) leaving Yonge Street westbound are shown.  If a westbound trip originated at St. Clair West Station, it is not included.
  • When I did the analysis, there were reference points at Bathurst and at Dufferin.  The short turn charts cannot distinguish between cars going only to Vaughan (and thence to Roncesvalles Carhouse) and those going to Oakwood because both points are in between the same pair of reference locations.  Reasonable assumptions about which destination applies can be based on the time of day when a westbound carhouse trip is likely, or not.  (This is a problem of my own creation by the choice of reference points and has nothing to do with the TTC’s data.)
  • Starting at about 11am on Friday, April 20 through Sunday, April 22, streetcar service operated between Yonge and St. Clair West Station with buses going further west.  A few trips show up on the “short turn charts” which were operated by buses that came through to Yonge Street and therefore were picked up in the westbound analysis.

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