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| Re: Subway Planning (1324736) | |||
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Re: Subway Planning |
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Posted by randyo on Fri Nov 21 15:33:57 2014, in response to Re: Subway Planning, posted by BusRider on Fri Nov 21 09:14:46 2014. When I first started in scheduling in late 1976, the schedule makers wrote out the timetables and work programs on special sheets which were then given to typists to copy onto mimeograph (remember those?) to be run off on multiple. Later on, the schedules were typed on standard paper and photocopied for distribution. T make a work program, the schedule maker would copy the timetable with only the terminal points onto graph paper which was known as a “check sheet” and build the runs by copying the individual trips onto another piece of graph paper called the “work sheet” with the appropriate headings at the top of the page. The runs were built by copying the first trips of the starting midnight runs until a second trip could be added to the first one in accordance with minimum guidelines for recovery time and lunch periods. Midnight and AM runs were built forward until the early PM trips were reached at which point the schedule maker would take the last of the finishing PM trips and start building the finishing PM runs backwards into the early PM and midday. During this process, some trips would have to be moved between runs in order to properly balance out the work program until the schedule maker was satisfied with the number and quality of the runs. When the runs were initially generated they were consecutively numbered until the work program was finalized at which time the runs were renumbered with the 3 digit numbering system used by rapid transit scheduling: 100 series for midnight runs, 200 series for AM runs and 300 series for PM runs. Runs starting after 1000pm (2200) were midnight runs for the next days work and the midnight reports ended at 359AM (0359). Reports from 400AM (0400) to 1159AM (1159) were AM runs and reports from 1200 N (1200) till 959PM (2159) were PM runs. The finished work program was then handed off to the typists where they were transferred to the appropriate sheets for copying and distribution. Computer scheduling has changed this slightly and after the timetables are created in the timetable editor, the completed timetable is copied to the work program generator and the computer created the runs some of which may still have to be “dressed up” by the schedule maker to insure maximum efficiency and productivity. Many times, I was able to build all my runs by going forward but the forward/backward method was the recommended procedure. Which method the computer uses I’m not sure, but I imagine the computer program builds only forward. Although I have noticed it doesn’t occur any more, when I was in scheduling the schedules for all 3 timetables daily, Sat and Sun were set in such a way that they wrapped around across midnight so that after around 1100PM (2300) all the departure times were the same. That would mean, for example that the reporting times for all the midnight runs would,be the same for the daily sat and Sun work programs and the finishing trips for the last D/S/S PM runs would finish at the same time also. It might happen that some finishing trips for the last PM runs would actually be after midnight of the next day, so those trips also had to match across all 3 timetables. |
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