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Semi-official Rochelle webcam discussion thread

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  • Member since
    August, 2005
  • From: At the Crossroads of the West
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Posted by Deggesty on Friday, August 04, 2017 8:13 PM

Quoting Balt: "After the first cold night of the season the track circuits would diminish as the physical plant becomes accustomed to cold weather." That sounds as though the track circuits were flesh and blood.

You did mean "...the problems of the track circuits woul diminish..." did  you not?

Johnny

  • Member since
    April, 2007
  • From: Iowa
  • 2,635 posts
Posted by Semper Vaporo on Friday, August 04, 2017 8:48 PM

Deggesty

"Firing crowbars"?Laugh 

What in the world could the system have meant?

Where I worked we had some power supplies that had a feature known as a "Crowbar"... if the power supply recognized an over Voltage or over current state, to save the circuit it was supplying power to, it would Short Circuit the output of the power supply... the term "Crowbar" came from the action being similar to laying a "Crowbar" (yes, a big metal wrecking tool) across the output of the power supply.

I assume the "Firing crowbars" may have been something similar... a means to protect the traction motors from over Voltage/current, or to immediately remove any power to the motors to bring them to a stop quickly.

Semper Vaporo

Pkgs.

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  • From: US
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Posted by BaltACD on Saturday, August 05, 2017 7:49 AM

Deggesty
Quoting Balt: "After the first cold night of the season the track circuits would diminish as the physical plant becomes accustomed to cold weather." That sounds as though the track circuits were flesh and blood.

You did mean "...the problems of the track circuits woul diminish..." did  you not?

In CTC territory when a train occupys a track segment, it 'turns on' the track occupancy light that corresponds to that track segment on the Train Dispatchers model board or other display.  The track occupancy light is commonly referred to as a 'track circuit'.  Broken rails and pull-a-parts, among other defects, also turn on 'track circuits'.

The normal chain of events is that a train operates over a track segment and goes onto the next track segment.  The track occupancy light for the original track segment stays lit, even though there is not a train occupying it.  The Dispatcher notices the 'track circuit' staying lit and reports it to Signals and MofW.  Signal maintainer and/or Track inspector inspect the territory covered by the track circuit and discover the reason it stayed on - in cold weather it is more likely a broken rail or a pull-a-part.  Once the defect is properly repaired, the track circuit display on the model board goes out.  To the Train Dispatcher, the experience of seeing unexplained track circuits is akin to feeling a flesh and blood occurence on 'HIS' railroad.

Another frequent cause of a track circuit staying on is a 'broken bond wire' - a wire that is welded directly to the rails where joint bars join the rails together.  The bond wire insures the electrical connection between the rails and doesn't rely on the metal to metal connectivity of all the parts that constitute the joint bars, as over time all those parts will develop a rust surface and rust does not a good electrical conductor.

My statement was meant to infer was that once the weather turns cold and stays cold - through a variety of actions - the components of the track structure adjust their stresses and defects that are caused by temperature change diminish.  By the same token, the first hot day of Spring will present it's own issues account temperature change.

Never too old to have a happy childhood!

  • Member since
    December, 2004
  • From: wilsonville, or
  • 34 posts
Posted by schmaltz on Friday, August 11, 2017 11:31 AM

I believe that many trains hstill have cabooses at the end. They are just shaped like full sized locomotives now.

  • Member since
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  • From: Calgary AB. Canada
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Posted by AgentKid on Saturday, August 12, 2017 2:12 PM

Well this is impressive.

The sixth train, a EB UP has just crossed the diamonds alternating with BNSF trains just like any traffic light in any city. No muss, no fuss, no waiting.

schmaltz
I believe that many trains hstill have cabooses at the end. They are just shaped like full sized locomotives now.

I think so.Smile Sure seems like it.

Bruce

 

So shovel the coal, let this rattler roll.

"A Train is a Place Going Somewhere"  CP Rail Public Timetable

"O. S. Irricana"

. . . __ . ______

  • Member since
    August, 2008
  • From: Calgary AB. Canada
  • 2,096 posts
Posted by AgentKid on Saturday, August 12, 2017 2:19 PM

Or, to put it another way, both the UP and BNSF dispatcher's "Big Pictures" must have been in focus.

Maybe they have a new sync app.

Bruce

 

So shovel the coal, let this rattler roll.

"A Train is a Place Going Somewhere"  CP Rail Public Timetable

"O. S. Irricana"

. . . __ . ______

  • Member since
    May, 2003
  • From: US
  • 11,908 posts
Posted by BaltACD on Saturday, August 12, 2017 2:58 PM

AgentKid
Well this is impressive.

The sixth train, a EB UP has just crossed the diamonds alternating with BNSF trains just like any traffic light in any city. No muss, no fuss, no waiting.

 

 
schmaltz
I believe that many trains hstill have cabooses at the end. They are just shaped like full sized locomotives now.

 

I think so.Smile Sure seems like it.

Bruce

Remember - where trains get stopped (because of road crossings) because they don't have a 'straight shot' across the diamonds are out of view of the camera - by upto several miles.  What you are seeing across the diamond may not be all that fluid and well timed as it seems.

Never too old to have a happy childhood!

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