PTC Project 2017 - 2018 Positive Train Control homestretch

Discussion relating to commuter rail, light rail, and subway operations of the MBTA.

Moderators: CRail, sery2831

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.
User avatar
BostonUrbEx
 
Posts: 3807
Joined: Thu Dec 03, 2009 9:55 pm
Location: Winn to MPT 8, Boston to MPN 38, and Hat to Bank

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.
neman2
 
Posts: 179
Joined: Sun Apr 01, 2012 4:16 pm

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.
harshaw
 
Posts: 131
Joined: Thu Jan 02, 2014 4:17 pm

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. :(
Backshophoss
 
Posts: 5541
Joined: Mon Mar 05, 2012 7:58 pm

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.
"The destination of this train is [BEEP BEEP]" -announcement on an Ashmont train.
User avatar
MBTA3247
 
Posts: 2666
Joined: Tue Jul 11, 2006 6:01 pm
Location: Milton

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.
Moderator: Massachusetts Bay Transportation Authority
Avatar:3679A (since wrecked)/3623B (now in service as 3636B).
User avatar
CRail
 
Posts: 2282
Joined: Tue May 18, 2004 8:27 am
Location: Eastie

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.
User avatar
BandA
 
Posts: 2455
Joined: Thu Oct 11, 2012 11:47 am

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.
neman2
 
Posts: 179
Joined: Sun Apr 01, 2012 4:16 pm

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?
johnpbarlow
 
Posts: 1905
Joined: Fri Mar 12, 2004 12:50 pm

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. :(
Backshophoss
 
Posts: 5541
Joined: Mon Mar 05, 2012 7:58 pm

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.
Reason: Nesting quote removed
User avatar
BandA
 
Posts: 2455
Joined: Thu Oct 11, 2012 11:47 am

Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby twropr » Wed Oct 03, 2018 8:33 pm

Does anyone know why MBTA is bustituting during weekends on the Lowell Line? All the "T" would say is that they are running PTC test trains. I don't understand why that would interfere with scheduled operations.
Andy
twropr
 
Posts: 641
Joined: Tue Dec 29, 2009 6:26 pm

Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby Trinnau » Wed Oct 03, 2018 9:00 pm

twropr wrote:Does anyone know why MBTA is bustituting during weekends on the Lowell Line? All the "T" would say is that they are running PTC test trains. I don't understand why that would interfere with scheduled operations.
Andy


Giving a test train free run of the tracks allows it to do what/where/when it wants. It is the most efficient use of a test train. It also allows adjustments to the system to be made unimpeded if problems are found during testing. If the test train had to work around scheduled service they'd sit idle if the desired test operation was in conflict with scheduled service. With a deadline looming at the end of the year they're probably just trying to expedite the testing as best possible. Getting those few extra tests in every day adds up over time.

The GLX project is also performing work at the same time in a lot of cases.
Trinnau
 
Posts: 442
Joined: Thu Sep 16, 2010 7:27 pm

Re: PTC Project 2017 - 2018 Positive Train Control homestret

Postby ziggyzack1234 » Thu Oct 04, 2018 1:14 pm

Trinnau wrote:
twropr wrote:Does anyone know why MBTA is bustituting during weekends on the Lowell Line? All the "T" would say is that they are running PTC test trains. I don't understand why that would interfere with scheduled operations.
Andy


Giving a test train free run of the tracks allows it to do what/where/when it wants. It is the most efficient use of a test train. It also allows adjustments to the system to be made unimpeded if problems are found during testing. If the test train had to work around scheduled service they'd sit idle if the desired test operation was in conflict with scheduled service. With a deadline looming at the end of the year they're probably just trying to expedite the testing as best possible. Getting those few extra tests in every day adds up over time.

The GLX project is also performing work at the same time in a lot of cases.



Yeah. The T is trying to get as much in as they can with the shutdowns. I bet the wifi project would have been taking advantage of this too had it not been for the 70ft monopole problem.
ziggyzack1234
 
Posts: 21
Joined: Fri Jun 09, 2017 4:54 pm

Previous

Return to Massachusetts Bay Transportation Authority (MBTA)

Who is online

Users browsing this forum: No registered users and 9 guests