rdamonThirty-three train cars derailed yesterday morning roughly 30 miles from the Nevada-Utah border near the small town of Caliente https://www.msn.com/en-us/autos/news/brand-new-jeep-gladiators-and-chevy-silverados-destroyed-after-train-derails-in-nevada/ar-AAEbqlI?ocid=spartanntp
https://www.msn.com/en-us/autos/news/brand-new-jeep-gladiators-and-chevy-silverados-destroyed-after-train-derails-in-nevada/ar-AAEbqlI?ocid=spartanntp
The available pictures don't show that this was a 'stringline' type derailment.
Never too old to have a happy childhood!
BaltACD The available pictures don't show that this was a 'stringline' type derailment.
That is an accordion type derailment.
New vehicles -- so the UP train must have been westward? Which means downgrade.
Euclid BaltACD The available pictures don't show that this was a 'stringline' type derailment. That is an accordion type derailment.
Accordian is not a type of derailment - it is a result of a derailment.
Yeah I knew you were going to say that. But is that accordion result not a type?
Is an accordion the same as a jacknife? It seems to me that a jacknife is the opposite of a stringline.
Neither accordian or jacknife are causes of derailments - they are results of a derailment and are caused by the need to disapate the remining kenitic energy that is contined in the still moving portion of the train after the originally derailed car begins moving slower than all the cars that are following it.
If train A-Z has 26 cars. Car A derails on comes to a stop in very short order - the kinetic energy in cars B-Z has to be disapated - with car A derailed it will not remain in perfect alignment with cars B-Z - the angular difference between A & B will define how the accordian will affect the movement of cars B-Z as the disapate their retained kenitic energy from the moment of derailment.
We have all seen this before, but it indicates kinetic energy needing to be dispated in a derailment better than most -
BaltACD Neither accordian or jacknife are causes of derailments - they are results of a derailment and are caused by the need to disapate the remining kenitic energy that is contined in the still moving portion of the train after the originally derailed car begins moving slower than all the cars that are following it. If train A-Z has 26 cars. Car A derails on comes to a stop in very short order - the kinetic energy in cars B-Z has to be disapated - with car A derailed it will not remain in perfect alignment with cars B-Z - the angular difference between A & B will define how the accordian will affect the movement of cars B-Z as the disapate their retained kenitic energy from the moment of derailment. We have all seen this before, but it indicates kinetic energy needing to be dispated in a derailment better than most
We have all seen this before, but it indicates kinetic energy needing to be dispated in a derailment better than most
Yes, I understand those points very well. Actually, though, I would say that stringlining is also the result of a derailment and not the cause, just as jacknifing is the result not the cause. The cause of stringlining is too much transverse force produced by pulling cars too hard through a curve. When the limit to this force is reached, a wheel climbs the rail, and only that excessive transverse force is the cause of the derailment. Everything from that first wheel climbing the rail to the point where the action stops is the result of the derailment. So a stringling is the result of too much transverse force by pulling too hard through a curve. Only the excess transverse force is the cause.
rdamon BaltACD The available pictures don't show that this was a 'stringline' type derailment. Agree, This is just a recent event that I did not think warrented a new thread.
I agree however, Amtrak's excuse of 'unscheduled trackwork' is unique.
BaltACD rdamon BaltACD The available pictures don't show that this was a 'stringline' type derailment. Agree, This is just a recent event that I did not think warrented a new thread. I agree however, Amtrak's excuse of 'unscheduled trackwork' is unique.
Thanks to Chris / CopCarSS for my avatar.
Murphy SidingDue to an unscheduled derailment no doubt.
You mean to imply scheduled derailments and precision scheduled derailroading have become a 'thing' now? Hmmmm... Euclid and I have to ponder this.
Scheduled derailmets? I will have to think about that one also. Must be part of EHH's PSR philosp[hy.
oltmanndThey guys who are pretty astute about budgets, rules and safety aren't always the best at physics..
Overmod Murphy Siding Due to an unscheduled derailment no doubt. You mean to imply scheduled derailments and precision scheduled derailroading have become a 'thing' now? Hmmmm... Euclid and I have to ponder this.
Murphy Siding Due to an unscheduled derailment no doubt.
Murphy Siding Overmod Murphy Siding Due to an unscheduled derailment no doubt. You mean to imply scheduled derailments and precision scheduled derailroading have become a 'thing' now? Hmmmm... Euclid and I have to ponder this. Wouldn't the next logical step in PSR be to schedule the derailments in the off-peak hours? I mean, it looks good on paper, so it's gotta work.
Wouldn't the next logical step in PSR be to schedule the derailments in the off-peak hours? I mean, it looks good on paper, so it's gotta work.
Many advantages there. If off-peak=night, then with quick cleanups they can pretend it never happened.
charlie hebdoMany advantages there. If off-peak=night, then with quick cleanups they can pretend it never happened.
The only thing is at night they might have to pay employees overtime or shift differential, thus costing more. Public relations often seems rather low on the priority. The possibility of saving a couple of thousand dollars by scheduling the derailment at the start of the normal working hours will be attractive!
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