This month, Graphic Insight takes a look at Brisbane’s current Suburban rail service as documented in QR’s public timetables of September 16th 1995.
The three graphs below each summarise one route on Brisbane’s northside. The horizontal axis covers three days of time; the left side of the graph being 00 hours on Friday morning, and the right being 23 hours Sunday night. The vertical axis is service frequency in trains per hour. Each hour of each day has one bar illustrating how many trains depart Central Station on that line. Trains running to various destinations on the line are indicated by different degrees of shading, so that the total number of trains running on the line (in the one direction) is indicated by the height of the stack-bar. Extra late-night services operating on Fridays compared to Mondays-Thursdays are illustrated similarly. (All these Friday only trains run to the terminus of the line).
This brief profile shows that there is a distinct peak flow which covers two hours or so, and a smaller counter-peak flow in the mornings. Many of these peak services are short-workings, and indeed short-workings operate only in the peaks. Following the increase in Sunday services to 30 minute intervals, the service level on each day of the week is similar except for peak periods Mon-Fri. The extended operation late into the evening on Friday and Saturday nights is evident also.
The similarity between the lines is also quite striking, with the Caboolture line benefiting from higher peak-hour services, and some long-distance services scattered throughout the day on top of the 30 min interval service boosting the hourly trains from 2 to 3 in some hours. These trains however generally serve only Caboolture station and beyond.
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