In this article, I turn to a view of the data for 501 Queen that shows the reliability of service as seen from headways (the passengers’ point of view), and from schedules (TTC Operations’ point of view).
As in previous analyses, there are charts for both December and January, but I recommend that readers look at the January charts first. The service in January is generally better behaved, and you will get a better sense of what these would look like, ideally, from those charts. December was a complete disaster both for headway and schedule reliability.
Each set of charts presents the time a specific run was seen at a point on each weekday in a month. If the service were running perfectly on time, the data points should be identical for each day, and we would get a series of straight lines across the page. That type of chart is the exception, and in the worst cases the chart is a hodgepodge of points.
The five pages of each set show first an overview of the entire am or pm peak, and the next four pages show each hour in greater detail. Where the same run appears on two or more successive days, the points are connected by lines. Breaks in these lines indicate runs that did not pass the location on some days.
The horizontal lines on the chart are spaced at the scheduled headway for the am and pm peak periods as a reference. In an ideal world, there should be a car in each horizontal slice of each chart.
This view of the data would likely change substantially if the line were managed to headway without regard for schedules. The runs would appear all over the place depending on how service was managed, but there would be something present on a regular basis in each column. Indeed, this chart would become meaningless, and the headway charts in Part 3 would be the major reference for service reliability.
One caveat about these charts. A special schedule was operated over the Christmas and New Year’s period which is similar but not identical to the regular one. You will see a slightly different pattern of run numbers in late December and early January corresponding to the weeks when this schedule was used.