eustis22 wrote:>Until such time as Haverhill is mostly double tracked, just about any schedule change which improves service on the other Northside lines will damage Haverhill schedules.
Why? Because there are only 10 platforms at North Station?
In order to prevent disruptions on one line from taking the others down, the new schedules dramatically reduce interlining trainsets: Haverhill sets will be Haverhill sets, Lowell sets will be Lowell sets, etc. This in turn means that, except for at the beginning of PM peak (when you can use sets laying over near Boston), an outbound requires an inbound arriving around 15 minutes earlier. The level of singletracking in turn constrains the frequency with which inbound trains can come into BON when there are more than four outbounds in a roughly 2.5-hour period (basically, if a Haverhill line outbound departs, there's a 30 minute or so window starting 5 minutes later where no inbound can arrive, so any outbound scheduled to depart within 50 or so minutes of the previous departure has to use a layover set; the interlining limit implies 4 Haverhill sets available for layover).
(I'm focusing on that aspect because, looking at the comparison, the main changes are to make PM more peaky compared to the shoulders).
While not a scheduling proposal per se, one way to improve overall service on the Haverhill line could involve moving Malden Ctr to zone 1 from 1A, and having about half of the trains terminate/originate at Malden Ctr (there appear to be enough sidings south of there where a train could change ends). Making those trains all-Interzone would save passengers money by reducing their fares by more than a subway fare (as nearly everyone would transfer) while allowing for more bidirectional service and better equipment utilization.