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Is slack still necessary?

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  • Member since
    January 2003
  • From: Kenosha, WI
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Posted by zardoz on Tuesday, June 10, 2008 3:06 PM

 NP Red wrote:
This is a little off the subject but awhile back I read a post in which an engineer was saying that he would have the AC locomotive in notch 6 or 7 before releasing the train brakes. This was a heavy coal drag, I think.  I would love to hear some of the tricks that you engineers have used to get a train moving. I bet there are things the management doesn't aprove of, too.

If you're running all GE locomotives, and are going to 'release' from a service application, that will work.  If you're running EMD's, you will get scrap metal somewhere.

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Posted by Railway Man on Tuesday, June 10, 2008 4:45 PM
 zardoz wrote:

Engineers are wrong as often as anyone else.  Each of us has our areas of relative expertise.  That's why a good dispatcher will consult with an engineer if he has any questions about how to plan a meet or overtake; and a good engineer will consult with the dispatcher if there is any question as to how trains are to be blocked, prioritized, etc. 

FYI: I left railroading years ago, and am now a truck dispatcher.  I frequently ask my drivers about what would be the best way to do certain runs.  The drivers are the ones actually at the customer location; they see what is going on; they are familiar with the territory; they know what their truck can do and cannot do; that's why I ask their advice. Sometimes they will ask me why I am routing them a certain way, and I always take the time to explain why (customer priority, late shipments, etc).

Tongue-in-cheek almost never comes across in the written word, my apologies if I misled you.

I was fortunate in my dispatching days to have some hot runners and savvy conductors who helped make my job easier.  Having read hundreds of your posts, your skills and dedication to the industry can't be questioned.  I wish you were still working in railroading.

RWM

  • Member since
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  • From: Muncie, Indiana...Orig. from Pennsylvania
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Posted by Modelcar on Tuesday, June 10, 2008 8:07 PM

....Zardoz:

Thanks for your reply.  It sure does make sense if a train stalls on a grade, there would seem to be little chance to restart it {with the same power}, using any kind of trick.  The power didn't get any stronger than right at the point of stall.

Quentin

  • Member since
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  • From: My Old Kentucky Home
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Posted by mackb4 on Tuesday, June 10, 2008 9:25 PM

 Sometimes when a train "stalls out" it's simply due to the traction motors getting to hot from excessive amperage for too long of a time.

 I have had to set the automatic brake brake,drop the generator field switch down,center the reverser and cool the traction motors down witht the cooling fan for the traction motors.This sometimes will get you going again.

 Now starting on a grade without slack is accomplished with placing the throttle in about the 2nd or 3rd notch,releasing the independent brake (engine) then releasing the automatic (train) brake,and start pulling remembering your amperage rating.

 We do this on "draped" trains coming west out of Bluefied,WVa.

 And by the way.I've had GE's slip up on hills quicker than I have EMD's.GE's load much slower than an EMD.

 Now I've had a second unit drop out (stall or die) while doing this before in Bluefield coming west,and 'hang on sally",grap some big air quick ,because you go backwards real fast if you don't catch it Shock [:O]

 Then check the problem out and try again.

 At least in Bluefield you got the option to get a pusher Cool [8D]

Collin ,operator of the " Eastern Kentucky & Ohio R.R."

  • Member since
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  • From: Naples, FL
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Posted by Ted Marshall on Friday, June 20, 2008 12:12 AM
 mackb4 wrote:

 Sometimes when a train "stalls out" it's simply due to the traction motors getting to hot from excessive amperage for too long of a time.

 

This is also the reason for most traction motor failures during starting when tractive effort is at its highest. Overloading for too long of a duration.

  • Member since
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  • From: Roanoke, VA
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Posted by BigJim on Friday, June 20, 2008 10:53 AM

If the train stalls on a hill, taking slack will do no good.  The tonnage is too much, no matter what you do.  If you stall, the only way to move up the hill is to double (triple, whatever) the hill.

Depends on why you stalled in the first place. It's not always about tonnage. Weather and rail conditions will contribute more to stalling than anything.

Some D/A MofW clown decided it would be a good idea to send a HiRail truck out to grease the rails. Didn't take long for that idea to shoot itself in the foot! Trains stalled everywhere, not to mention losing control going downhill!!! So much for Safety First!

If you're running all GE locomotives, and are going to 'release' from a service application, that will work.  If you're running EMD's, you will get scrap metal somewhere.

BS!!!

Go back to dispatching trucks.

.

  • Member since
    April 2008
  • From: Western Wyoming
  • 162 posts
Posted by UPRR engineer on Friday, June 20, 2008 12:04 PM
 BigJim wrote:

 

If you're running all GE locomotives, and are going to 'release' from a service application, that will work.  If you're running EMD's, you will get scrap metal somewhere.

BS!!!

Go back to dispatching trucks.

 

No he's kinda right, if you have a heavy train stopped on a grade, with a few SD90's in your consist.... will rip her in half easy.

  • Member since
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  • From: Roanoke, VA
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Posted by BigJim on Friday, June 20, 2008 3:03 PM

with a few SD90's in your consist

A few!!! As in "I've got a GE in the lead and a few SD90's in the consist"? How many units are you trying to run? Those knuckles will only take so much.

will rip her in half easy.

I guess you could if you didn't take your time.
Hard for me to believe though, because I had one of those storied SD90AC and a GE Dash-9AC and they wouldn't pull a greasy string out of a cat's pitoot! As a matter of fact, the Lance Armstrong wannabe's passed me going uphill with 2000 tons less than the units were rated for!

.

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