Red Line cable replacement

Discussion related to DC area passenger rail services from Northern Virginia to Baltimore, MD. Includes Light Rail and Baltimore Subway.

Moderators: Robert Paniagua, therock, mtuandrew

Red Line cable replacement

Postby farecard » Thu Dec 14, 2017 11:15 pm

https://www.washingtonpost.com/local/trafficandcommuting/metro-audit-shows-red-line-defect-similar-to-the-one-that-caused-deadly-2009-collision/2017/12/14/4ebe74c8-e0ff-11e7-89e8-edec16379010_story.html

It's not clear what this article is talking about. If it is the cables from the transmitter/receiver cards to the WeeZee bonds, they are not 19,000 ft long. There will be many pairs, 2 per block.
User avatar
farecard
 
Posts: 708
Joined: Thu Oct 02, 2008 2:40 am

Re: Red Line cable replacement

Postby davinp » Fri Dec 15, 2017 8:56 am

Unplanned audit finds the failing cable could have caused a collision

https://wtop.com/tracking-metro-24-7/20 ... lem-crash/

Metro does not need to wait until they are 40 years old or failing to replace them.
davinp
 
Posts: 531
Joined: Sun Nov 20, 2005 8:03 pm
Location: Woodbridge, VA

Re: Red Line cable replacement

Postby srepetsk » Fri Dec 15, 2017 9:37 am

farecard wrote:https://www.washingtonpost.com/local/trafficandcommuting/metro-audit-shows-red-line-defect-similar-to-the-one-that-caused-deadly-2009-collision/2017/12/14/4ebe74c8-e0ff-11e7-89e8-edec16379010_story.html

It's not clear what this article is talking about. If it is the cables from the transmitter/receiver cards to the WeeZee bonds, they are not 19,000 ft long. There will be many pairs, 2 per block.


It's referring to the cabling running in between the TCRs.
srepetsk
 
Posts: 224
Joined: Sat May 16, 2015 12:57 am

Re: Red Line cable replacement

Postby farecard » Fri Dec 15, 2017 10:18 am

srepetsk wrote:
It's referring to the cabling running in between the TCRs.


A) I would hope the system would fail safe when such happens.

B) 90% of the cost is labor. You'd a thunk they would put in glass instead/in addition to copper; the future benefits of which would be huge.

But it's Metro......
User avatar
farecard
 
Posts: 708
Joined: Thu Oct 02, 2008 2:40 am

Re: Red Line cable replacement

Postby srepetsk » Fri Dec 15, 2017 2:36 pm

They can't put in fiber between the rooms if the equipment in the rooms isn't digital. The Silver Line has redundant fiber runs between those TCRs, but that's only because it's newer equipment that can handle multiple routes.

And yes, there should be data verification/parity bits to ensure the info is correct, but I don't know any specifics about that in between TCRs.
srepetsk
 
Posts: 224
Joined: Sat May 16, 2015 12:57 am

Re: Red Line cable replacement

Postby farecard » Fri Dec 15, 2017 3:07 pm

srepetsk wrote:They can't put in fiber between the rooms if the equipment in the rooms isn't digital.


Yes they can. As I said "in addition" as in: along with the immediately needed copper. Not only for not-far-in-the-future use in this application but also for others.

I don't have details but have heard they rent a metric truckload of circuits from VZ and others. Giving that on an ISO layers chart, the most important is 0 (right of way), and Metro has a lock on that aspect; they should be exploiting it to the nth.
User avatar
farecard
 
Posts: 708
Joined: Thu Oct 02, 2008 2:40 am

Re: Red Line cable replacement

Postby Sand Box John » Fri Dec 15, 2017 8:49 pm

@ srepetsk and farecard

My understanding from a conversation on reddit are the cables in question are vital circuit cables that connect adjacent train control rooms to one another that are used to carry the track circuit occupancy information at the ends of the territory controlled by adjacent train control room. In other words it tells train control room B06 that a train is occupying first and or second track circuit on track B2 at the south end of the B07 train control room territory. The cables are part of the block signing system.

The RTU to ROCC comm link uses T1 style channel banks carried on a SONET ring network over fiber along with most of the rest of the IP voice, video and data traffic (MetroNet) need to support the operation of the railroad.
John in the sand box of Maryland's eastern shore.
User avatar
Sand Box John
 
Posts: 2773
Joined: Sun Jan 01, 2006 8:55 pm
Location: Hebron Maryland

Re: Red Line cable replacement

Postby farecard » Fri Dec 15, 2017 9:33 pm

I had been told many years ago that there was some fiber but it was since saturated with the DHS Big Brother cameras, and they'd rented other circuits to cope. But maybe they got a clue somewhere along the line and upgraded the backbone.
User avatar
farecard
 
Posts: 708
Joined: Thu Oct 02, 2008 2:40 am

Re: Red Line cable replacement

Postby STrRedWolf » Sat Dec 16, 2017 8:42 am

farecard wrote:I had been told many years ago that there was some fiber but it was since saturated with the DHS Big Brother cameras, and they'd rented other circuits to cope. But maybe they got a clue somewhere along the line and upgraded the backbone.


I hope they're adding a few more fiber lines then. I heard MTA had 16 fiber lines for their light rail system but after sacking someone for misconfiguring the signal network, only needed three of them lit.
"The last and final stop is BALTIMORE PENN STATION." I can has MARC V?
User avatar
STrRedWolf
 
Posts: 869
Joined: Sat Oct 24, 2015 5:18 pm
Location: Baltimore, MD

Re: Red Line cable replacement

Postby farecard » Sat Dec 16, 2017 10:50 am

One of many things Hogan cut from the Purple Line was the redundant fiber.
User avatar
farecard
 
Posts: 708
Joined: Thu Oct 02, 2008 2:40 am

Re: Red Line cable replacement

Postby STrRedWolf » Sat Dec 16, 2017 8:01 pm

farecard wrote:One of many things Hogan cut from the Purple Line was the redundant fiber.


First canceling the Red Line, then BaltimoreLink, and now trimming the Purple Line's construction, which was in the works since... my college years? Wait, I did a web comic about it... November 24th, 1999?!?

Ooooh I'm glad we put in the Charger order when O'Malley was governor...
"The last and final stop is BALTIMORE PENN STATION." I can has MARC V?
User avatar
STrRedWolf
 
Posts: 869
Joined: Sat Oct 24, 2015 5:18 pm
Location: Baltimore, MD

Re: Red Line cable replacement

Postby MCL1981 » Mon Dec 18, 2017 1:28 pm

STrRedWolf wrote:
farecard wrote:One of many things Hogan cut from the Purple Line was the redundant fiber.


First canceling the Red Line, then BaltimoreLink, and now trimming the Purple Line's construction, which was in the works since... my college years? Wait, I did a web comic about it... November 24th, 1999?!?

Ooooh I'm glad we put in the Charger order when O'Malley was governor...


Well that's what happens when someone takes office that understands money doesn't grow on trees.
MCL1981
 
Posts: 665
Joined: Sun Nov 11, 2012 9:23 am

Re: Red Line cable replacement

Postby STrRedWolf » Mon Dec 18, 2017 7:06 pm

MCL1981 wrote:Well that's what happens when someone takes office that understands money doesn't grow on trees.


I can understand canceling the Red Line, but reworking how to build the Purple Line stinks of how the Light Rail got put in first -- as cheaply as the bond that was floated would allow.

Should of had a full subway built by now.
"The last and final stop is BALTIMORE PENN STATION." I can has MARC V?
User avatar
STrRedWolf
 
Posts: 869
Joined: Sat Oct 24, 2015 5:18 pm
Location: Baltimore, MD


Return to DC - Maryland - Virginia Area Passenger Rail: MTA(MARC), VRE, WMATA(Metro)

Who is online

Users browsing this forum: No registered users and 2 guests