Newburyport Line extension

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Re: Newburyport Line extension

Postby F-line to Dudley via Park » Mon Dec 01, 2014 4:41 pm

BostonUrbEx wrote:
nomis wrote:And some of the Chelsea area fixes would come if Silver Line to Chelsea happens.


The Silver Line to Chelsea is happening, but there will be no grade crossing removals.


Everett Ave. gets much, much worse in fact because of the frequently-crossing buses. And that's already one of the most dangerous ones on the entire system for backed-up car queues. Of all the things to cheap out on with SL Gateway, this was the one that throws the biggest monkey wrench in speeds and congestion for all modes. Indefensible, but they seem hellbent on finding that out the hard way.
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Re: Newburyport Line extension

Postby deathtopumpkins » Wed Dec 03, 2014 10:20 am

Speaking of improvements to the Eastern Route, I found this on the T website, which is either new or I hadn't noticed before:
http://www.mbta.com/about_the_mbta/t_pr ... 6442452879

Final design for the first phase of replacing Beverly Draw was apparently supposed to be finished in November. Has anyone heard anything about this? Will the replacement span allow higher speeds?
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Re: Newburyport Line extension

Postby F-line to Dudley via Park » Wed Dec 03, 2014 10:53 am

deathtopumpkins wrote:Speaking of improvements to the Eastern Route, I found this on the T website, which is either new or I hadn't noticed before:
http://www.mbta.com/about_the_mbta/t_pr ... 6442452879

Final design for the first phase of replacing Beverly Draw was apparently supposed to be finished in November. Has anyone heard anything about this? Will the replacement span allow higher speeds?


It's not a replacement. "Moderate" in-place rehab for not-large money, which is why it hasn't drawn a lot of public attention. Has been programmed in the budget for years now.


Will improve reliability of the swing a good deal by doing overdue replacement of the worn-out machinery and parts of the superstructure most likely to get stuck. Approach span work fixes some longstanding problems with the decayed pilings. But it's nowhere near the same universe as the megabucks "like-new" rebuild of the Merrimack span in Haverhill. This falls more in the line of cycled rehab that has to be done about once every 2 decades to a movable span of this advanced age to keep it in non-deficient working condition, whereas the Haverhill megaproject is fully rolling back the clock to a whole new 'rebooted' 75-year rated lifespan.
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Re: Newburyport Line extension

Postby deathtopumpkins » Wed Dec 03, 2014 11:20 am

F-line to Dudley via Park wrote:
deathtopumpkins wrote:Speaking of improvements to the Eastern Route, I found this on the T website, which is either new or I hadn't noticed before:
http://www.mbta.com/about_the_mbta/t_pr ... 6442452879

Final design for the first phase of replacing Beverly Draw was apparently supposed to be finished in November. Has anyone heard anything about this? Will the replacement span allow higher speeds?


It's not a replacement. "Moderate" in-place rehab for not-large money, which is why it hasn't drawn a lot of public attention. Has been programmed in the budget for years now.


Will improve reliability of the swing a good deal by doing overdue replacement of the worn-out machinery and parts of the superstructure most likely to get stuck. Approach span work fixes some longstanding problems with the decayed pilings. But it's nowhere near the same universe as the megabucks "like-new" rebuild of the Merrimack span in Haverhill. This falls more in the line of cycled rehab that has to be done about once every 2 decades to a movable span of this advanced age to keep it in non-deficient working condition, whereas the Haverhill megaproject is fully rolling back the clock to a whole new 'rebooted' 75-year rated lifespan.


I get that it's a fairly minor thing, but it says right there in the T page I linked to "full replacement of the steel superstructure swing span", and then rehabilitation of the existing approach spans. That sounds to me like a replacement of the swing span using the existing approaches. Unless you know more than is on the website?
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Re: Newburyport Line extension

Postby F-line to Dudley via Park » Wed Dec 03, 2014 11:51 am

deathtopumpkins wrote:
F-line to Dudley via Park wrote:
deathtopumpkins wrote:Speaking of improvements to the Eastern Route, I found this on the T website, which is either new or I hadn't noticed before:
http://www.mbta.com/about_the_mbta/t_pr ... 6442452879

Final design for the first phase of replacing Beverly Draw was apparently supposed to be finished in November. Has anyone heard anything about this? Will the replacement span allow higher speeds?


It's not a replacement. "Moderate" in-place rehab for not-large money, which is why it hasn't drawn a lot of public attention. Has been programmed in the budget for years now.


Will improve reliability of the swing a good deal by doing overdue replacement of the worn-out machinery and parts of the superstructure most likely to get stuck. Approach span work fixes some longstanding problems with the decayed pilings. But it's nowhere near the same universe as the megabucks "like-new" rebuild of the Merrimack span in Haverhill. This falls more in the line of cycled rehab that has to be done about once every 2 decades to a movable span of this advanced age to keep it in non-deficient working condition, whereas the Haverhill megaproject is fully rolling back the clock to a whole new 'rebooted' 75-year rated lifespan.


I get that it's a fairly minor thing, but it says right there in the T page I linked to "full replacement of the steel superstructure swing span", and then rehabilitation of the existing approach spans. That sounds to me like a replacement of the swing span using the existing approaches. Unless you know more than is on the website?


The approaches are just pier work...stuff that probably hasn't been touched since the thing was first built. From what's been described in ancient threads here that's all below-deck work done off barges with those temp drydock structures for accessing below the water level. Other than maybe speed restrictions to reduce load on the piers during the most critical phases that whole Phase I shouldn't affect train service or cause track outages at all. Based on what I Googled from old local news articles this project has been in agonizingly slow planning for 10 years now and the North Shore has been barking to the T about lack of progress on it since at least 2008.


The swing span isn't getting a full and complete replacement like, say, a couple of the Amtrak Shoreline bridges in CT (Thames River, etc.) got their bascules totally ripped out and replaced by cleanroomed lift spans fitted to the existing approaches. It's a moving parts renewal and rail deck replacement, but the structure including the actual physical swing aren't being touched and will still be 'original' condition. Project's all limited to stuff that has to be normally cycled every few decades on a frequently-used moving span no matter what its age. I'm not even sure the swing mechanism got much in the way of touch-up during the 1985 repairs after that severe 1984 fire on the approach span severed commuter rail for a year, so the relative invasiveness of the swing rehab is cycled renewal + pulling out of a deep deferred maintenance pit because they haven't been doing cycled component renewal anywhere near as often as they should've.
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