[quote user="BigJim" above]i
On late-model wheel-slip detectors, only if slipping at the same rotational speed, which hardly happens, and is why newer wheel-slip detection is less likely to fail.
foamductor An old school SD40-2 like that will be using the old school IDAC wheel slip control system. There are various ways it (and later Super Series) can fail where you would never know that you are getting runaway wheelslip like that unless you were physically riding that engine. (or it was night.)
An old school SD40-2 like that will be using the old school IDAC wheel slip control system. There are various ways it (and later Super Series) can fail where you would never know that you are getting runaway wheelslip like that unless you were physically riding that engine. (or it was night.)
Exactly!!!
Keep in mind that the units are NOT comparing axle speeds to others throughout the consist! Once all of the axles are spinning, the unit doesn't see a wheel slip.
I thought that we have had this discussion before and debunked all of the myths some of you are trying to perpetrate!
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I have to wonder if failure of slip control is the only issue on that unit. Note how the train speeds up when the throttle is dropped enough to stop the slip. Is it possible that a defective governor on the victim unit is overmodulating field?
zugmann SD70Dude I saw this before the uploader disabled commenting, and there were some real idiots and ignoramuses trying to throw their weight around. The uploader is correct, the wheelslip control system is obviously not working on that locomotive. Yeah, the uploader made enough ignorant and moronic statements in his description. Didn't need any more help.
SD70Dude I saw this before the uploader disabled commenting, and there were some real idiots and ignoramuses trying to throw their weight around. The uploader is correct, the wheelslip control system is obviously not working on that locomotive.
Yeah, the uploader made enough ignorant and moronic statements in his description. Didn't need any more help.
SD70DudeI saw this before the uploader disabled commenting, and there were some real idiots and ignoramuses trying to throw their weight around. The uploader is correct, the wheelslip control system is obviously not working on that locomotive.
The opinions expressed here represent my own and not those of my employer, any other railroad, company, or person.
Why didn't the engineer back up to take in the slack and then move forward? Would have allowd him to move forward as he streched the train.
Caldreamer
Seems that NS may have some issues with 'wheel slip' ? The linked YT video shows several photographed circumstance of what appear to be sevier cases of 'wheel slip' involving their motive power.
The photo shown above[ posted by BaltACD] was during a period that happened several years back(?) There was a particularly bad set of circumstances on NS down South (?).
I don't remember all the details, but apparently, an NS train developed a problem with wheel slip. By the time it had stopped; ithe lead unit was on a trestle bridge; over a creek or river. The locomotive still running, and caught fire. The crew was forced to jump from their train into the body of water,; either both were severely injured by their action of jumping from the burning engine, it was not a happy outcome. The story went on for some time on a Forum Thread.
If you expand the comment there is a link to a photo..
Leo_AmesSo that didn't cause a lot of rail damage? I would've thought that the best course of action would've involved isolating the locomotive.
I would've thought that the best course of action would've involved isolating the locomotive.
So long as the train was 'moving' even at ever so slow a speed - the rail damage will be minimal. Had the train stopped and stayed in one place for a extended period of time the rail damage would become increasingly worse with the time the spinning wheels ground away on the same location.
I can't determine how closely the engineer was viewing the situation as whenever he notched the throttle back the wheel slipping stopped and the rate of forward motion increased, ever so slightly. Then when the locomotives were notched up the wheel slipping started again and the rate of forward motion decayed to barely perceptable.
Potential rail damage below
Never too old to have a happy childhood!
Loram might feel slighted ?
Were all the units DC traction ? Tell us if I'm wrong. If 4 units operated over run 3 or 4 at creeping speed would they normally get a knuckle or drawbar ? If so why not isolate unit and provide more throttle to remaining units ? Was that train coming up on DC short time ratings at that speed ?
One consequence of NS waiting so long to order AC traction motors ?
Isolating the locomotive would have meant that the train could not be started, and would have to double the hill or receive an assist.
I have no doubt that it caused at least some of that rail damage (this may not have been the first such incident at that location).
Train and engine crews report to operating department supervisors, and the main concern of all of them is getting the train over the road as quickly as possible. Replacing the rail and repairing the locomotive are the problems of the engineering and mechanical departments, and their costs come out of different budgets than those of train operations.
The best solutions would have been to assign more power to the train in the first place, or perhaps do better preventative maintenance on the locomotives.
Greetings from Alberta
-an Articulate Malcontent
So that didn't cause a lot of rail damage?
I saw this before the uploader disabled commenting, and there were some real idiots and ignoramuses trying to throw their weight around. The uploader is correct, the wheelslip control system is obviously not working on that locomotive.
What should the crew have done in that situation? Exactly what they did, try to keep the train moving and report the defective unit to the Diesel Doc. The crew did not decide to take a tonnage train on that grade with a defective locomotive, but now here they are, and they have to make the best of it.
If the crew had called a supervisor and asked for instructions they most likely would have been told to keep trying until the train completely and certainly stalled.
The alternative would be doubling the hill, which delays the train and ties up the line, as well as potentially causing them to run out of hours and need to be relieved.
https://www.youtube.com/watch?v=07vc1q73i-c
Quite the light show.
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