In my opinion, all trains should be all stops, including North Adelaide. Let's see why.Nort wrote: ↑Fri Apr 26, 2019 9:32 amTo do that would either require building and managing overtaking lanes for trains or eliminating the express services. I also wonder if there is anywhere near enough patronage to support 24 trains running on the line at one any time.
All stops trains, including North Adelaide, take 56 minutes to travel from Gawler to Adelaide. During the day, most trains follow one of two stopping patterns. Pattern A trains will stop at half of the small stations, pattern B will stop at the other half. Travel times from Gawler to Adelaide are:
Pattern A: 52 minutes
Pattern B: 50 minutes
At 7:51 on Weekdays, there is a non-stop train from Adelaide to Salisbury. It takes 21 minutes. Compare to all-stops at 29 minutes. This a larger saving, but there are other big stations in between that this train skips.
My point is that there is not much time saving with skipping small stations. For people at the small stations, during the day, their frequency gets cut to once every half an hour. At the big stations, the frequency is once every 15 minutes.
So the average wait is 15 minutes at the small stations and 7.5 minutes at the big stations. Average journey time from Gawler to Adelaide during the day is:
(Pattern A + Pattern B)/2 + Average wait
(52 + 50)/2 + 7.5 = 58.5 minutes
If we make all trains all stops and increase frequency to every five minutes, the average journey time from Gawler to Adelaide during the day is:
All stops + Average wait
56 + 2.5 = 58.5 minutes
So by making all trains all stops, but increasing the frequency to every five minutes, the journey time between Gawler and Adelaide is unchanged. However, those passengers now have the option of getting off at more stations and the journey time for everyone else is faster, especially for people at the small stations.
The other big benefit as I pointed out earlier, is that bus timetables are always synchronised with the trains, because the trains are always coming!