PTC Project 2017 - 2018 Positive Train Control homestretch

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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby BostonUrbEx » Mon Jun 11, 2018 4:26 pm

Arlington wrote:I believe PTC works by GPS and Radio, both of which like the height


The wood poles are for the comm lines to support the PTC communications between sites. Only the metal poles with antenna arrays are actually transmitting.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby neman2 » Mon Jun 11, 2018 8:14 pm

harshaw wrote:Well, by having these poles & wires above ground these will be the first things that fail when we have trees fall on the right of way. And after last year, we can guarantee that will happen.


They actually have been aggressively clearing trees along the right of way in many places. It's quite surprising how far they are going, even to the top of slopes in cut areas. Which is the right thing to do to maintain the ROW.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby harshaw » Mon Jun 11, 2018 8:43 pm

That's great. But you know, trees grow, especially towards sunlight. If you really want to protect lines you burying them. Our electrical infrastructure is so error prone in New England because of above ground lines.

On a right of way with a straight and clear access , using trenching equipment seems like an obvious way to avoid future maintenance.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby Backshophoss » Mon Jun 11, 2018 9:19 pm

Trenching works well unless you are dealing with rocky ground,MBTA figured out that pole lines were cheaper to do then trenching,due to rocks
and plenty of unmarked underground utility lines crossing the ROW. :(
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby MBTA3247 » Mon Jun 11, 2018 9:29 pm

Poles may also be faster than trenching, and the T needs to get PTC installed as fast as they can.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby CRail » Tue Jun 12, 2018 11:54 am

And when there is a problem, above ground lines are restored much more quickly. A tree coming down on a line can be rectified and repaired within a couple hours. Railroads have had above ground communication lines since the 1800s, it's not that big of a deal.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby BandA » Sat Jun 23, 2018 2:39 pm

The problem, mentioned earlier or elsewhere, is the wifi project is using underground conduit and the PTC project is using poles and they are being done at about the same time, with no economy of scale.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby neman2 » Sat Jun 23, 2018 6:53 pm

Where are they installing underground conduit for wifi? I thought the wifi project was suspended because of objections from abutters to the installation of 70 foot monopoles needed to make it work.
Last edited by CRail on Thu Jun 28, 2018 11:13 am, edited 1 time in total.
Reason: Unnecessary quote removed.
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby johnpbarlow » Sun Jun 24, 2018 5:05 am

In my recent visits to CPF-333 and the Wachusett T station (Pan Am owned track), I have not seen yet any fiber-optic cable pole or wayside transponder installation happening, unlike on the balance of the Fitchburg line on MBTA-owned track. Anyone know the status of PTC HW installation on the Fitchburg to Westminster segment of T operations?
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby Backshophoss » Sun Jun 24, 2018 6:26 pm

Figure on PAR making life difficult for ACSES installation crews on PAR trackage,untill the PAR/MBTA dispute on ACSES installs on PAR locos is settled. :(
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Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby BandA » Tue Jun 26, 2018 12:06 am

neman2 wrote:
Where are they installing underground conduit for wifi? I thought the wifi project was suspended because of objections from abutters to the installation of 70 foot monopoles needed to make it work.
Probably, I don't know.
Last edited by CRail on Thu Jun 28, 2018 11:14 am, edited 1 time in total.
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