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CAREFUL USE OF DYNAMIC BRAKING

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CAREFUL USE OF DYNAMIC BRAKING
Posted by Euclid on Monday, July 1, 2024 1:33 PM
I found a notice published by BNSF in 2020, which cautions engineers on how to minimize the risk of derailing their trains that comes from improper use of dynamic brakes.  It says that the company has had a number of recent derailments that were caused by improper use of dynamic braking.
 
The notice begins with the following:
 
“Engineers making rapid adjustments of dynamic brakes while attempting to slow/control train speed or attempting to stop have contributed to several recent derailments.  In all events, the slack was not adequately gathered before advancing to the higher-braking notches therefore causing a severe run-in event and subsequent derailment.”
 
With other brake systems, such as ones on cars and trucks, ships and other heavy equipment, the brake systems only raise the question of whether they will work when needed and whether they can stop in time for emergencies. But train dynamic braking is unique in the number of operational variables that can jeopardize the safety of its use.
 
Since the notice linked here states that there has been a recent increase in derailments caused by improper use of dynamic brakes; I wonder how they can determine that such misuse has occurred.  Do locomotives have recorders that document dynamic brake application force, timing, location, etc.?
 
If they do have such recorders, do they also have onboard equipment that can record (or calculate) the buff force generated by dynamic braking throughout the train, and the relative danger that it imposes, if any?
 
I would guess not.  But even if they don’t record those forces, can they estimate them based on train weight, consist, and speed; coupled with that actual record of dynamic brake usage?
 
Otherwise, if this caution is supposed to be achieved only by the reckoning of the engineer, it seems like a tall order, as indicated by this BNSF notice.
 
  
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Posted by CSSHEGEWISCH on Monday, July 1, 2024 1:53 PM

i'm sure that the engineers among us will vouch that knowledge of careful use of the dynamic brake comes with experience, just like careful use of the air.

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Posted by BaltACD on Monday, July 1, 2024 2:27 PM

Engineers 'could' be termed - Professional Slack Adjusters

Slack is the force that Engineers must control in getting today's 10K, 15K and 20K foot trains across their assigned territories.  Mishandling of the slack with excessive buff forces or excessive draft forces, in either/or both circumstance damage to the train can happen that may or may not end up in a derailment.

Train handling is a skill that Engineers learn with the seat of their pants with every trip they take across their terrirories.  They learn where the slack runs in and where it runs out - with the size trains that are being operated in the 21st Century and the territories the trains are being operated across - a train can have multiple slack actions taking place within it - all at the same time - a run in on the first 50 cars and a run out on the second 50 car and a run in on the third 50 car with the fourth 50 cars 'running free'.  The train is operating over multiple grades and dips all at the same time with the slack moving throughout the train as the terrain it is operating over changes.

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Posted by Euclid on Monday, July 1, 2024 2:30 PM

https://lawblet13.org/wp-content/uploads/2022/08/su-2020-02T.pdf

 

I think this above link will open the notice that is pertinent to this topic.  

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Posted by ns145 on Monday, July 1, 2024 2:53 PM

Euclid
I found a notice published by BNSF in 2020, which cautions engineers on how to minimize the risk of derailing their trains that comes from improper use of dynamic brakes.  It says that the company has had a number of recent derailments that were caused by improper use of dynamic braking.
 
The notice begins with the following:
 
“Engineers making rapid adjustments of dynamic brakes while attempting to slow/control train speed or attempting to stop have contributed to several recent derailments.  In all events, the slack was not adequately gathered before advancing to the higher-braking notches therefore causing a severe run-in event and subsequent derailment.”
 
With other brake systems, such as ones on cars and trucks, ships and other heavy equipment, the brake systems only raise the question of whether they will work when needed and whether they can stop in time for emergencies. But train dynamic braking is unique in the number of operational variables that can jeopardize the safety of its use.
 
Since the notice linked here states that there has been a recent increase in derailments caused by improper use of dynamic brakes; I wonder how they can determine that such misuse has occurred.  Do locomotives have recorders that document dynamic brake application force, timing, location, etc.?
 
If they do have such recorders, do they also have onboard equipment that can record (or calculate) the buff force generated by dynamic braking throughout the train, and the relative danger that it imposes, if any?
 
I would guess not.  But even if they don’t record those forces, can they estimate them based on train weight, consist, and speed; coupled with that actual record of dynamic brake usage?
 
Otherwise, if this caution is supposed to be achieved only by the reckoning of the engineer, it seems like a tall order, as indicated by this BNSF notice.
 
  
 

It's 2024 why wouldn't they be able to monitor and analyze this type of data?

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Posted by adkrr64 on Monday, July 1, 2024 3:25 PM

Any locomotive in use on a Class 1 will have an event recorder, which will record various data about the operation of the locomotive, including brake system pressures, throttle position, and dynamic brake amperage. Many are programmed to "phone home" when certain events are detected, such as an emergency application or excessive use of power braking. All of that data would be available to management to use while trying to determine the cause of a derailment. While locomotives don't contain sensors to monitor in-train forces, combining the event recorder data with the train make-up information would allow someone to estimate those forces with some degree of accuracy (assuming they know how to do all that math or have a simulator to do it for them).

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Posted by Overmod on Monday, July 1, 2024 3:43 PM

This is essentially a continuation of an earlier Euclid post (about a derailment in a sag that was said to have been complicated by dynamic application) which originated in a different discussion about the use of 'heavy dynamic' as an aggravating factor at East Palestine.  (I look forward to the promised NTSB report to see what, if anything, they say explicitly about this...)

The issue is that no monitoring of dynamic application, even one that allows extraction of rate of change of application or release, says anything definitive about in-train forces or momenta.  In theory you could get a defective 'first approximation' if you had sufficiently-instrumented "in-train FREDs" as we've discussed as means to reduce service applications in the absence of ECP.  You could get an even better approximation from one of the 'on-car instrumentation' solutions being bruited about, if they included some modern version of LVDT measuring draft-gear displacements in realtime with fast communication to the locomotive computer.  But any of that is science fiction -- with a very expensive pricetag to implement even with a time-scale of years -- in modern practice.

The obvious Bucky-style short-term 'fix' would be to apply the same kind of 'excitation delay' to dynamic application that GE applies to 'motoring' (in part in order to reduce pollution from accelerating the diesel prime mover 'too quickly').  Ideally this would include some mapping, perhaps "user-selectable" in some way, about how fast the dynamic excitation changes over time vs. what a 'combined power handle' might produce when moved by the engineer to different ranges of dynamic.

That could be thought of as similar to the approach we used in designing the 'freight-compatible' train-control solution for Conrail in the wake of the Chase wreck -- that was originally intended only to modulate the Westinghouse brake 'as a human engineer would' for a given consist, but it was extended to include versions (or in some cases approximations) to 'blended braking' by setting up dynamic for situations short of 'wiped full emergency' stops in nominal minimum distance.   You could still implement this, probably in software, without too much conceptual difficulty...

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Posted by jeffhergert on Monday, July 1, 2024 9:25 PM

adkrr64

Any locomotive in use on a Class 1 will have an event recorder, which will record various data about the operation of the locomotive, including brake system pressures, throttle position, and dynamic brake amperage. Many are programmed to "phone home" when certain events are detected, such as an emergency application or excessive use of power braking. All of that data would be available to management to use while trying to determine the cause of a derailment. While locomotives don't contain sensors to monitor in-train forces, combining the event recorder data with the train make-up information would allow someone to estimate those forces with some degree of accuracy (assuming they know how to do all that math or have a simulator to do it for them).

 

Not only does it record the information, on the modern engines management can remote in to a locomotive in real time.  They do our annual check ride in this manner.

After an incident, such as any undesired emergency application, our Operations Command Center (OPCC) calls up the train to check if the air is coming back or the conductor is walking.  They also will check the download to see what was happening at the time of the incident.  If the train was being operated by one of the Energy Management System's auto throttle, then they aren't concerned with any possible train handling deficiency. 

Jeff

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Posted by adkrr64 on Tuesday, July 2, 2024 9:06 AM

jeffhergert
 They also will check the download to see what was happening at the time of the incident.  If the train was being operated by one of the Energy Management System's auto throttle, then they aren't concerned with any possible train handling deficiency. 

The computer caused the problem? Well then, nothing to see here. Let's all just move on....

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Posted by ns145 on Tuesday, July 2, 2024 11:10 AM

adkrr64

 

 
jeffhergert
 They also will check the download to see what was happening at the time of the incident.  If the train was being operated by one of the Energy Management System's auto throttle, then they aren't concerned with any possible train handling deficiency. 

 

The computer caused the problem? Well then, nothing to see here. Let's all just move on....

 

All kinds of trains can be torn up as long as fuel is being saved. Tongue Tied

Actually, I think that the railroads see such "events" as opportunities to provide the feedback necessary to further refine the TO and LEADER software.  It's all part of the larger plan to eventually get to crewless operation after a transition period with 1-person crews. 

I sympathize with engineers.  If they screw up they get "handled" and usually very roughly with time off with no pay.  If the computer screws up its an "enlightening learning experience".  The duplicity is enough to make even the most even tempered person lose their minds. 

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Posted by Euclid on Tuesday, July 2, 2024 12:07 PM

Overmod

This is essentially a continuation of an earlier Euclid post (about a derailment in a sag that was said to have been complicated by dynamic application) which originated in a different discussion about the use of 'heavy dynamic' as an aggravating factor at East Palestine.  (I look forward to the promised NTSB report to see what, if anything, they say explicitly about this...) 

 

I am not offering a fix for this problem, and nor do I have one.  So I am not proposing anything, let alone a short term fix, as you say.  My thoughts here are based only on the problem described by BNSF, which is that they have had several recent derailments caused by human error of their engineers by flailing to control in-train forces related to dynamic braking.  
 
In the BNSF Safety Update, the BNSF says they have had derailments caused by improper use of dynamic brakes, which had caused excess buff forces, which then buckled the train and derailed it. Since they appear to be blaming the engineers for these derailments, I am just wondering how they determined that those excess forces had occurred. In other words, from where does BNSF get their evidence that dynamic braking was misused?
 
That is why I asked if they have recorders to measure and record those buff forces or other types of in-train forces related to slack action and dynamic braking.  I suppose they could reach the conclusion that bad train handling was the cause, just by the event recorder data.   
 
The Company also requires their engineers to account for the following factors:
 

1)   Train makeup.

2)   Speed.

3)   Grade/curvature.

4)   Type and axle limitations of the dynamic brake.

5)   Amount of slack.

6)   Current slack in train.

7)   Car types in train.

8)   Power configuration including distributed power consists and position in train. 

 
So, that is a total of eight technical factors, all interacting with each other, and four of them constantly changing.  So, all of this to control in-train forces, which is the primary responsibility of the engineer.  With so much riding on making the right decisions, it seems to me that more detection systems will be needed.  The experience BNSF is having with an increasing number of derailments seems to confirm the need for better detection.
 
Not only would better detection prevent these derailments by monitoring train operation, but it would also record any misuse of dynamic braking.  With those abilities, I suppose the detection could simply prevent the misuse. 
 
Otherwise, for example, how do they expect engineers to know the entire amount of slack in a train and the locations of where it is stretched or bunched?  And that is just the “tip of the iceberg” of correlating these eight factors.
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Posted by CSSHEGEWISCH on Tuesday, July 2, 2024 1:49 PM

It comes under the heading of experience.

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Posted by Gramp on Tuesday, July 2, 2024 3:27 PM

CSSHEGEWISCH

It comes under the heading of experience.

 

Kind of like knowing how to land a plane safely in the Hudson River after a group of birds have laid waste to your engines. 

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Posted by BaltACD on Tuesday, July 2, 2024 3:57 PM

Gramp
 
CSSHEGEWISCH

It comes under the heading of experience. 

Kind of like knowing how to land a plane safely in the Hudson River after a group of birds have laid waste to your engines. 

Which then leads to another question - 

If that Hudson River flight had been propeller driven instead of jet propelled.  Would the propellers have chopped their way through the bird flock vs. the jet engines ingesting the birds and causing the gets to flame out and stop?

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Posted by Euclid on Tuesday, July 2, 2024 5:05 PM

CSSHEGEWISCH

It comes under the heading of experience.

 

Well then what is causing the derailments that BNSF is talking about?

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Posted by BaltACD on Tuesday, July 2, 2024 5:49 PM

Euclid
 
CSSHEGEWISCH

It comes under the heading of experience. 

Well then what is causing the derailments that BNSF is talking about?

Lack of experience.

Us 'boomers' that hired out in the 60's through the early 80's, that have carried the carriers for decades - are retiring and being replaced with newly hired employees.

The path from hiring off the street to have one behind a engineers console on a locomotive is realtively rushed.  When I was working, people were hired off the street to become Conductors and after nominally ONE YEAR of working as a Conductor they were tapped in seniority order to take Engineer's training.  I am not totally conversant the aspects of Engineer Training before they are 'graduated' and marked up as Engineer Trainee and paired with 'experienced' engineer on a call by call basis as the ET board moves in realtion to the Engineer's Board.  

Promotion to Engineer is greatly influenced by the ability of the existing Engineer's Board to satisfy the level of business - if business is going great balls of fire, the Road Foreman of Engines are more likely to Qualify a Trainee to be a working Engineer than if business is slack and layoffs may be in to offing.

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Posted by jeffhergert on Tuesday, July 2, 2024 9:17 PM

BaltACD

 

 
Euclid
 
CSSHEGEWISCH

It comes under the heading of experience. 

Well then what is causing the derailments that BNSF is talking about?

 

Lack of experience.

Us 'boomers' that hired out in the 60's through the early 80's, that have carried the carriers for decades - are retiring and being replaced with newly hired employees.

The path from hiring off the street to have one behind a engineers console on a locomotive is realtively rushed.  When I was working, people were hired off the street to become Conductors and after nominally ONE YEAR of working as a Conductor they were tapped in seniority order to take Engineer's training.  I am not totally conversant the aspects of Engineer Training before they are 'graduated' and marked up as Engineer Trainee and paired with 'experienced' engineer on a call by call basis as the ET board moves in realtion to the Engineer's Board.  

Promotion to Engineer is greatly influenced by the ability of the existing Engineer's Board to satisfy the level of business - if business is going great balls of fire, the Road Foreman of Engines are more likely to Qualify a Trainee to be a working Engineer than if business is slack and layoffs may be in to offing.

 

It's been a long time since those going through the engineer's training program having actually worked as an engineer for us.  We started running engineer's training programs in my area last year.  Because we don't force guys in seniority order, as long as someone younger in seniority willing to go, they don't force someone.  When they do start forcing people, it's those at the bottom of the trainmen's seniority that meet the required time qualifications (I think now it's 2 years) that get forced.  They will credit previous railroad experience from other companies to meet the minimum time requirement.  I've had a few trainees who had previous experience from other railroads. 

Our company, and I imagine others, like a reserve that can be called as-needed to fill engineer spots.  (Since they are working set-back as conductors, it works out better than having a reserve of furloughed trainmen.)  This means that someone goes through the training program, gets certified as an engineer, then never touches a throttle again for a few years.  Unless they find an engineer willing to let them have some throttle time.  Assuming the set back person wants throttle time.  

So you have an engineer, on paper, who's been engineer qualified for 3 to 5 years but in reality has 6 to 8 months training and experience who gets an emergency call to work as an engineer. 

Jeff    

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Posted by mvlandsw on Tuesday, July 2, 2024 9:33 PM

BaltACD

The engines powering the propellers would still require air flow to operate. I imagine that this could be blocked by a slug of ground up bird bodies.

 

 
Gramp
 
CSSHEGEWISCH

It comes under the heading of experience. 

Kind of like knowing how to land a plane safely in the Hudson River after a group of birds have laid waste to your engines. 

 

Which then leads to another question - 

If that Hudson River flight had been propeller driven instead of jet propelled.  Would the propellers have chopped their way through the bird flock vs. the jet engines ingesting the birds and causing the gets to flame out and stop?

 

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Posted by Euclid on Wednesday, July 3, 2024 6:51 PM

BaltACD

 

 
Euclid
 
CSSHEGEWISCH

It comes under the heading of experience. 

Well then what is causing the derailments that BNSF is talking about?

 

Lack of experience.

Us 'boomers' that hired out in the 60's through the early 80's, that have carried the carriers for decades - are retiring and being replaced with newly hired employees.

The path from hiring off the street to have one behind a engineers console on a locomotive is realtively rushed.  When I was working, people were hired off the street to become Conductors and after nominally ONE YEAR of working as a Conductor they were tapped in seniority order to take Engineer's training.  I am not totally conversant the aspects of Engineer Training before they are 'graduated' and marked up as Engineer Trainee and paired with 'experienced' engineer on a call by call basis as the ET board moves in realtion to the Engineer's Board.  

Promotion to Engineer is greatly influenced by the ability of the existing Engineer's Board to satisfy the level of business - if business is going great balls of fire, the Road Foreman of Engines are more likely to Qualify a Trainee to be a working Engineer than if business is slack and layoffs may be in to offing.

 

If the BNSF cannot hire enough people who have enough training or experience to avoid causing derailments from poor handling of dynamic braking, how can management overcome that problem?
 
The BNSF Safety Update says the problem is caused by this: 
 
“Engineers making rapid adjustments of dynamic brakes while attempting to slow / control train speed or attempting to stop have contributed to several recent derailments.  In all events, the slack was not adequately gathered before advancing to the higher-braking notches therefore causing a severe run-in event and subsequent derailment.”
 
If BNSF cannot hire enough people who can learn and apply the proper procedure to eliminate the problem described above, Why not just solve the problem with a technical modification of the dynamic brake controls?
 
If the problem is that engineers do not adequately gathering the slack before advancing to the higher braking notches, do this:
 
Make the controller unable to advance to the higher braking notches until the slack is adequately gathered. How complicated can that be?  It seem like a reasonable solution to a problem that can derail a train just because the controls were not operated quite right.  
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Posted by BaltACD on Wednesday, July 3, 2024 8:30 PM

Euclid
 
BaltACD 
Euclid 
CSSHEGEWISCH

It comes under the heading of experience. 

Well then what is causing the derailments that BNSF is talking about? 

Lack of experience.

Us 'boomers' that hired out in the 60's through the early 80's, that have carried the carriers for decades - are retiring and being replaced with newly hired employees.

The path from hiring off the street to have one behind a engineers console on a locomotive is realtively rushed.  When I was working, people were hired off the street to become Conductors and after nominally ONE YEAR of working as a Conductor they were tapped in seniority order to take Engineer's training.  I am not totally conversant the aspects of Engineer Training before they are 'graduated' and marked up as Engineer Trainee and paired with 'experienced' engineer on a call by call basis as the ET board moves in realtion to the Engineer's Board.  

Promotion to Engineer is greatly influenced by the ability of the existing Engineer's Board to satisfy the level of business - if business is going great balls of fire, the Road Foreman of Engines are more likely to Qualify a Trainee to be a working Engineer than if business is slack and layoffs may be in to offing. 

If the BNSF cannot hire enough people who have enough training or experience to avoid causing derailments from poor handling of dynamic braking, how can management overcome that problem?
 
The BNSF Safety Update says the problem is caused by this: 
 
“Engineers making rapid adjustments of dynamic brakes while attempting to slow / control train speed or attempting to stop have contributed to several recent derailments.  In all events, the slack was not adequately gathered before advancing to the higher-braking notches therefore causing a severe run-in event and subsequent derailment.”
 
If BNSF cannot hire enough people who can learn and apply the proper procedure to eliminate the problem described above, Why not just solve the problem with a technical modification of the dynamic brake controls?
 
If the problem is that engineers do not adequately gathering the slack before advancing to the higher braking notches, do this:
 
Make the controller unable to advance to the higher braking notches until the slack is adequately gathered. How complicated can that be?  It seem like a reasonable solution to a problem that can derail a train just because the controls were not operated quite right. 

Any control that delays what it was commaded to do is more dangerous than one that performs what it is requested to do when it is requested.  The delay is percieved by the operator that the control is not working and in panic because the operator is not getting the response he asked for he will tend to increase the magnitude of the control he is requesting.

There is only ONE WAY to get experience - doing it day in and day out, getting the seat of the pants feel of what the response to the command is at a particular geographic location on the line. 

Euc - your inability to understand train handling dynamics is legendary.

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Posted by Euclid on Wednesday, July 3, 2024 10:14 PM

BaltACD

 

 
Euclid
 
BaltACD 
Euclid 
CSSHEGEWISCH

It comes under the heading of experience. 

Well then what is causing the derailments that BNSF is talking about? 

Lack of experience.

Us 'boomers' that hired out in the 60's through the early 80's, that have carried the carriers for decades - are retiring and being replaced with newly hired employees.

The path from hiring off the street to have one behind a engineers console on a locomotive is realtively rushed.  When I was working, people were hired off the street to become Conductors and after nominally ONE YEAR of working as a Conductor they were tapped in seniority order to take Engineer's training.  I am not totally conversant the aspects of Engineer Training before they are 'graduated' and marked up as Engineer Trainee and paired with 'experienced' engineer on a call by call basis as the ET board moves in realtion to the Engineer's Board.  

Promotion to Engineer is greatly influenced by the ability of the existing Engineer's Board to satisfy the level of business - if business is going great balls of fire, the Road Foreman of Engines are more likely to Qualify a Trainee to be a working Engineer than if business is slack and layoffs may be in to offing. 

If the BNSF cannot hire enough people who have enough training or experience to avoid causing derailments from poor handling of dynamic braking, how can management overcome that problem?
 
The BNSF Safety Update says the problem is caused by this: 
 
“Engineers making rapid adjustments of dynamic brakes while attempting to slow / control train speed or attempting to stop have contributed to several recent derailments.  In all events, the slack was not adequately gathered before advancing to the higher-braking notches therefore causing a severe run-in event and subsequent derailment.”
 
If BNSF cannot hire enough people who can learn and apply the proper procedure to eliminate the problem described above, Why not just solve the problem with a technical modification of the dynamic brake controls?
 
If the problem is that engineers do not adequately gathering the slack before advancing to the higher braking notches, do this:
 
Make the controller unable to advance to the higher braking notches until the slack is adequately gathered. How complicated can that be?  It seem like a reasonable solution to a problem that can derail a train just because the controls were not operated quite right. 

 

Any control that delays what it was commaded to do is more dangerous than one that performs what it is requested to do when it is requested.  The delay is percieved by the operator that the control is not working and in panic because the operator is not getting the response he asked for he will tend to increase the magnitude of the control he is requesting.

There is only ONE WAY to get experience - doing it day in and day out, getting the seat of the pants feel of what the response to the command is at a particular geographic location on the line. 

Euc - your inability to understand train handling dynamics is legendary.

 

Well, if you were to read the Safety Update, you would find that acting too fast (at least at the time of its publication) was causing derailments.  The Bulletin stresses the point of slowing the time between increases of dynamic braking, and the fact that they have engineers that are not doing that; and thus are causing derailments.  The Safety Bulletin is attempting to teach their employees how to properly operate dynamic braking in order to reduce the number of derailments.

But according to you, I guess the way to teach them is only by “seat of the pants.”  “Seat of the pants” leaning seems to be what is causing the mistake rather than somthing that could eliminate the mistake.    

I doubt that even engineers with too little “seat of the pants” learning would panic if they encountered a delay between calling for control action and receiving it—as you say.  Engineers would have no trouble dealing with a control response that was intentionally slowed to the proper spacing.  If necessary, the system could even display the action and its reason. 

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Posted by Paul of Covington on Wednesday, July 3, 2024 10:53 PM

Euclid
Make the controller unable to advance to the higher braking notches until the slack is adequately gathered. How complicated can that be?

   How would the controller know when the slack is adequately gathered?

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Posted by daveklepper on Thursday, July 4, 2024 6:03 AM

Possibly they are running trains too long?

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Posted by Backshop on Thursday, July 4, 2024 6:39 AM

daveklepper

Possibly they are running trains too long?

 

That's the REAL problem!  They are trying to blame the engineers for a corporate problem.

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Posted by Euclid on Thursday, July 4, 2024 12:07 PM

Paul of Covington

 

 
Euclid
Make the controller unable to advance to the higher braking notches until the slack is adequately gathered. How complicated can that be?

 

   How would the controller know when the slack is adequately gathered?

 

That is a bit of a problem.  The Safety Bulletin says to wait 10 seconds before transitioning from power to dynamic brake.  But it does not say how long to wait before transitioning from one amount of dynamic braking to a higher amount.  For that, the Bulletin just says to “Make braking changes slowly to allow slack to adjust smoothly.”
 
But then, the Bulletin also says this:  “At all speeds, it is imperative engineers plan in advance of where to slow/control train speeds and know the state of the slack in their train before advancing to higher braking notches.”
 
The Safety Bulletin also says under “Things to consider:”   “Amount of slack and current slack state in train." 
 
The amount of slack would be a fixed quantity, based on the number of cars and their individual amounts of slack.  I am guessing that “slack state” would be the extent to which each pocket of slack is stretched or bunched.  I cannot imagine a person accurately making that analysis in their head, as the amount constantly changes.
 
If trains are derailing due to improper locomotive operation, I think such instances should be fully investigated to learn exactly what happened.  And regarding comments by Daveklepper and Backshop; the FRA seems to have taken a keen interest in derailments caused by the effects of high in-train forces, especially as might be caused by exceptionally long trains. 
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Posted by zugmann on Thursday, July 4, 2024 12:11 PM

Euclid
The Safety Bulletin says to wait 10 seconds before transitioning from power to dynamic brake. 

That's been printed on the dynamic brake handle since there were dynamic brakes. 

It's been fun.  But it isn't much fun anymore.   Signing off for now. 


  

The opinions expressed here represent my own and not those of my employer, any other railroad, company, or person.t fun any

  • Member since
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  • From: Northern New York
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Posted by tree68 on Thursday, July 4, 2024 12:12 PM

Euclid
But then, the Bulletin also says this:  “At all speeds, it is imperative engineers plan in advance of where to slow/control train speeds and know the state of the slack in their train before advancing to higher braking notches.”

In other words, you have to know your territory.  Hills, valleys, hogbacks, curves - there are many things that will have an effect on how a train is running.  Understanding that is a key to clean train running.

One reason for waiting that ten seconds is because many locomotives take that time to adjust from power to braking.  It's  nothing new.

LarryWhistling
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Posted by Euclid on Thursday, July 4, 2024 12:30 PM
My only point is that the BNSF Safety Update is teaching their engineers these existing instructions about making dynamic brake changes slowly to reduce the number of derailments they are experiencing. 
 
They say that some of their engineers are not following these existing, operational requirements, thus they are contributing to the occurrence of derailments.  Nobody is saying that the operational requirements are new.   
  • Member since
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  • From: Central Iowa
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Posted by jeffhergert on Thursday, July 4, 2024 10:49 PM

zugmann

 

 
Euclid
The Safety Bulletin says to wait 10 seconds before transitioning from power to dynamic brake. 

 

That's been printed on the dynamic brake handle since there were dynamic brakes. 

 

With the coming of EMS auto control, it's been changed for us to only do the pause for DC locomotives.  The pause requirement doesn't apply to AC engines. EMS still waits 10 seconds before going to/from power and dynamic braking. 

The pause is related to the electrical equipment rather than train handling. 

Jeff 

  • Member since
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  • From: Central Iowa
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Posted by jeffhergert on Thursday, July 4, 2024 11:11 PM

I finally read the full, linked notice. Except for the part of recent derailments, it reads like standard train handling instructions/rules. I think Euclid is reading more into this notice. I don't think BNSF had a big jump in derailments due to improper dynamic brake operation. They obviously had some so they issued a bulletin. Four years ago.

The notice also says improper dynamic operation "contributed" to the  derailments. It doesn't say how much of the derailments was being placed on improper dynamic operation as opposed to other factors. It could be that the supervisory manager, while reviewing the download, noted the improper use and assigned more of the blame to the engineer rather than nonhuman contributing factors.

They all like to blame their employees whenever possible. 

Jeff

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