Over the holiday break we’ll dig into the archives a bit. This post by Matt was originally published in July 2014.
There has been a bit of comment on the blog recently questioning how Auckland runs it’s rail system. In particular around the whether the city should be running express trains or not. In this post I’m going to look at some of the positives and negatives on both sides of the argument. I’m mainly going to be thinking about this from a post electrification point of view so just looking at the network between Swanson and Papakura.
The Auckland’s rail network seems like it’s at a funny size, it’s neither a metro type system made up of lines 10-15km in length but with the exception of Papakura and Pukekohe isn’t really a super long distance commuter network either. Instead it’s somewhere awkwardly in between and made worse particularly on the western line by close station spacing which can make trips quite slow. A trip to Swanson is 27km while Papakura is 31km. We also know we also know from the comparison of the Auckland and Wellington networks that the average trip is about 13.7km in length.
The key benefit to express services is speed. We know that the vast majority of people are going to the city centre and so if we can get them to that destination faster it can help make services more competitive attractive. More attractive services should also mean more patronage which is obviously a good thing.
But how much time do they save. The figures below are from old timetables from when Auckland used to run express trains.
|Papakura||Britomart||All stations to Otahuhu||45||8|
|Swanson||Britomart||All stations to New Lynn, Newmarket||49||4|
As you can see the savings on the southern line aren’t too bad for the first of the express services on the southern line however the train is only able to achieve that by only stopping at 2 of the 14 stations along the way. In the case of the second express service the train stops at 8 of the 14 stations along the route. On the western line is actually quite small despite skipping all of the closely spaced inner stations, it skips seven stations all up.
Skipping stations isn’t ideal but can be worked around, especially if like New York where there are extra tracks which means the express services don’t affect the frequency of the all stopping trains. However in Auckland that isn’t the case. Further due to the limitations of Britomart we can only run 20 trains per hour on the network divided up as 6 trains per direction per hour on the Western, Southern and Eastern lines and 2 trains per direction per hour on the Onehunga line. Any express train that we run has to come at the expense of one of those services and that’s where the problems really start to come in as any express trains end up lowering the frequency to stations not served by both running patterns.
An example of how services could run was suggested by Dave B in this post.
It is possible to mix limited-stop and all-stop services without any overtaking, but it does disrupt the cherished ’10-min interval between trains’.
Take the Western Line: The express departs Britomart at, say, 00, 20, 40 past each hour, skips Parnell, bypasses Newmarket, first stop Grafton, then selected stops only, from there to Swanson. The stopper leaves Britomart at 02, 22, 42 and proceeds all-stops via Newmarket as now. It arrives at Swanson 2 min before the next express. The stopper takes 55min, the express 49min.
So say you wanted to go to Baldwin Ave, a station that would be guaranteed to be bypassed by any train running an express pattern. Using Dave’s suggestion above it means you only have the option of a train once every 20 minutes. That’s definitely not a turn up and go frequency but one you have to consult a timetable on to prevent long delays. Some suggest that people will only need to do that once however if they’re anything like me their travel doesn’t always happen at the same time. As an example I don’t leave work at the same time every day and arrive at Britomart with the intention of just catching the next train that leaves.
In addition to what’s already been mentioned is also the issue of the New Network which has been designed as an integrated PT network rather an a mode focused one. It will see a lot more bus feed a greater number of passengers on to rail services. Providing consistent and easy connections between those services will be another important step in building patronage.
The decision about whether to run express trains or not is going to differ for each city and for Auckland the decision is between having trains that are frequent but that stop at each station along the way or having lower frequencies but with some trains having faster trips. For me with the system we have I think that we are right to focus on getting frequency rather than speed. Faster speeds *should* come with the electric trains and the faster acceleration they bring will help narrow the gap between the two options further. My position would likely be different if we had the infrastructure and capacity to support express services that don’t get caught behind the train service in front but tat this stage that seems like something.