VOLKER LANDWEHR In 1944 the Army tried to derail a train by blowing out pieces of rail. The results are surprising: https://www.youtube.com/watch?v=agznZBiK_BsRegards, Volker
In 1944 the Army tried to derail a train by blowing out pieces of rail. The results are surprising: https://www.youtube.com/watch?v=agznZBiK_BsRegards, Volker
That's the one.
Larry Resident Microferroequinologist (at least at my house) Everyone goes home; Safety begins with you My Opinion. Standard Disclaimers Apply. No Expiration Date Come ride the rails with me! There's one thing about humility - the moment you think you've got it, you've lost it...
tree68 VOLKER LANDWEHR In 1944 the Army tried to derail a train by blowing out pieces of rail. The results are surprising: https://www.youtube.com/watch?v=agznZBiK_BsRegards, Volker
blue streak 1PDN Would your micrometer have to be at the same temperature for both measurements ? Or can it be calibrated before each measurement ? About pull aparts. If a train runs over a pull apart or at least part of a train how much damage will happen to the wheels for various distances ? That of course would depend on how much distance the pull apart is. Certainly more than a low rail joint. Wheel rail confence question ?
About pull aparts. If a train runs over a pull apart or at least part of a train how much damage will happen to the wheels for various distances ? That of course would depend on how much distance the pull apart is. Certainly more than a low rail joint. Wheel rail confence question ?
As the effect on wheels - that's best answered by a Mechancal Dept. person. I can say that the FRA allows railroads to authorize signalmen and MOW personnel field personnel to permit very slow speed (5 - 10 MPH as I recall) moves of trains over pull-aparts so as to keep the line moving, pending a repair. Presumably they wouldn't do that if there was a risk of wheel damage.
An opposite case was reported in the AREMA Proceedings a couple years ago. Something left gouges in a light rail system's new rail for about 2,000 ft. as I recall. It took quite a bit of detective work to figure out that it was apparently caused by a very hard machining tool bit that somehow became stuck in a light rail vehicle's wheel, though that is speculation because it was never found.
- PDN.
How wide can a pull-apart be and still allow the train to go over it?
Thanks to Chris / CopCarSS for my avatar.
As long as the wheels remain aligned with the other end of the gap and there is sufficient energy to climb the infinite grade of the broken rail end, it could be miles and miles. In practical terms, due to the variation in what is in the way along the bumpy ride over the ties and ballast, probably not very far. Watch that video referred to above and you will see that the gap can be substantial.
Semper Vaporo
Pkgs.
Murphy SidingHow wide can a pull-apart be and still allow the train to go over it?
Also depends very substantially on whether it's in a curve, if there is strong crosswind or other force tending to push a flange outward, or if the car is behind a DPU node in substantial buff (when small incremental changes in lateral force no longer self-correct as they do in draft).
I would suspect constant-contact side bearings are your friend in keeping truck yaw minimized over what is basically the analogue of a severe staggered low joint, even in some curves.
Semper Vaporo . . . and there is sufficient energy to climb the infinite grade of the broken rail end, . . .
Paul_D_North_Jr Semper Vaporo . . . and there is sufficient energy to climb the infinite grade of the broken rail end, . . . Roughly 4.5 to 5 MPH [for those who want to know, by h = v^2 x 2G where h = 8" = 0.67', solving for v in ft./sec., and then converting to MPH]. - PDN.
Roughly 4.5 to 5 MPH [for those who want to know, by h = v^2 x 2G where h = 8" = 0.67', solving for v in ft./sec., and then converting to MPH].
Offhand, I would think that diameter of the wheel and weight of the car should be a part of the calculation. Given the energy to pull, I think it should be possible to lift the empty or loaded car the required distance above the rail at a speed of fractions of a furlong per fortnight... assuming the wheel diameter would put the center of rotation above the height of the rail, otherwise the pull would just be trying to squish the end of the rail.
Semper Vaporo Offhand, I would think that diameter of the wheel and weight of the car should be a part of the calculation.
Offhand, I would think that diameter of the wheel and weight of the car should be a part of the calculation.
Unless we're talking about very small diameter wheels with the gap greater than the wheel diameter, the wheel is going to bridge the ends of the rails. For a 4 inch gap with wheel with a 36 inch tread diameter, the wheel will only drop about 0.1". For an 8 inch gap, the wheel will only drop ~0.45".
Offhand, I'd say you were on the right track.
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