Name the Exposition Blvd LRT Jul 24, 2012 10:54:14 GMT -8
Post by masonite on Jul 24, 2012 10:54:14 GMT -8
Say one commutes from Culver City to Little Tokyo or Long Beach to the Foothills as you used in your example. In the two line scenario, they can be assured of a train coming roughly every 6 minutes and taking them directly to their destination. In the trains split scenario, there will only be a train every 12 minutes so their headways just doubled.
Of course, from a scheduling and operational standpoint sending trains in different directions creates a major problem for Operations as it is much more simple to operate 2 separate lines. I'd imagine you'd have much more train bunching and potentially big problems in the Connector, because of this. Look at the problems with the Blue/Expo connection and this is relatively simple compared to this scenario.
The third major problem is that this creates confusion for the riders, especially those not frequently using the system. How do you show this on maps? How do you keep people from getting on the wrong trains? Just think of how much of a problem this is with the Purple/Red Lines and Expo/Blue and now triple it. There are ways to mitigate it, but this would still cause confusion.
So you have to weigh these three major disadvantages against the benefit of not having forced transfers. As someone who would use the Expo Line to go to Pasadena occasionally (and would almost never want to go to East LA), I can see the allure, but overall feel the negatives greatly outweigh the benefit.
I mentioned the added complexity of the schedule, but this is only a minor disadvantage and confusing only to first-time riders. Also, transferring is equally or more confusing to first-time riders.
The rest of what you said is not true.
Trains through Downtown wouldn't run with 12-minute headways. They would run for example as LB/LB/SM/SM/LB/LB/SM/SM. On the average, you still get 3-minute wait time for LB or SM, with the LB or SM headway changing between 3 minutes minimum and 9 minutes maximum, so still 6 minutes headways on the average for LB or SM. With the two-line scenario, the headway for SM or LB would be 6 minutes uniformly as they would run LB/SM/LB/SM/LB/SM/LB/SM through Downtown, and the average headway (6 minutes) and wait time (3 minutes) would still be the same.
Train-bunching assertion is also entirely incorrect. As I said, once a train is in the connector, the connector absolutely cannot tell the difference between an Expo and a Blue or a Gold and an Eastside train. Therefore, there is no change in train bunching from two to four lines at all.
Overall, Metro needs to make a more reliable consistent system, which is why they have not embraced this split approach and have opted for the more simple two line system so far. As far as riders not being confused, unless you are paying close attention as the train rolls up to a station you may miss the front banner showing the destination. People get in Expo trains that they think are Blue Line trains and Purple vs. Red all the time and not just first time riders. Also, showing this on a map is going to be a mess.
Headways will have to double in the example I have given. If Expo has 6 minute headways and now half those trains are headed to Pasadena instead of going East then that means those people going East just had their headway increased by 100%. There is no way around that unless you run more trains, but the Connector is limited in how many trains it can run per hour.