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they loose a solid tight grip on the spikes which hold the track gauge. As the gauge between rails widens, the train wheels drop between the rails.Train tracks most often loose gauge in curves, where the outside wheels push the rail out. Most railroads are replacing wood ties with concrete ties. Concrete ties are better as they are prestessed and poured with a metal slot to hold the base of the rail in place. But converting existing tracks to concrete ties is costly and time consuming.
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readable, by using simple identifier callouts (dimensions "A", "B", etc.) keyed to their meanings in the caption (this will also simplify the re-use of the diagrams in
Wikipedias of other languages). Also, the rail cross-section is tilted to the right; its significance should be explained, along with an explanation that it represents the outer rail of a banked right-turning curve.
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Hey guys and girls, I will be planning on doing a major redesign and cleanup of the article because it contains some weasel paragraphs that can go off topic. I have found one section "General
Introduction" that goes completely off topic, and I removed the section because of this. But there is more of
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tan (flange contact angle)". For general accessibility I would prefer to stick to tan (i.e. avoid arctan) by reversing the equation. I may have to label the flange contact angle ... I was hoping to avoid Greek letters for the same reason. Glad you agree about the cited accidents -- I was beginning to
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It needs a lot of work. I propose to remove some of the images, which do not assist the reader in understanding the article; also many of the references are simply to "a derailment took place at X on date Y" which in most cases add nothing to comprehension. Also the vast amount of text on rail breaks
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The first paragraph of this section
Methods_to_detect_rail_breaks needs to be clarified or eliminated. A "clean break" (head, web, and foot) is most unlikely and connecting "pins" to the head would not eliminate other conductive pathways. By the way, for transit properties a "clean" break would not
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I am neutral regarding a spinoff of the material on rail breaks to a separate article, but don't want to see the coverage lost. As for the material on rerailing, it definitely could be improved. I think the coverage is important in the context of the overall article, and would like to see a better
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I have made some progress on this. As I see it we need a few more citations, and some more consistent comparative statistics. I am mighty uncomfortable with the list of actual accidents. This seems quite random, and the use of the national flag and the present tense narrative sounds too sensational.
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I have added a few that (I believe) are illustrative; mine are all UK based so far; some more are needed, worldwide. Could I urge that any that are added are based on official factual reports ... newspaper reports and sensational "popular" books tend to be fanciful and focus on frivolous and lurid
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Concrete ties have much longer life than wooden ones, even though they cost more. Good timber sleepers are also hard to come by as forests are denuded. It therefore makes sense to change to concrete sleepers when the timber sleepers are life expired. Remember that is costs to change sleepers in
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Track caused derailments are usually caused by wide gauge. Proper gauge, the distance between rails, is 56.5 inches. As tracks wear from train traffic the rails tend to spread apart. This is primarily because wood ties weaken and crack from the stress of bearing train load tonnage. As ties weaken
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I would like to move towards referring directly in the text to accidents that illustrate the derailment mechanism being described. At all events entries like "United States June 30, 2010 A coal train derailment in
Wayzata, MN. No injuries." with no further detail is completely out of place here.
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The wheel-rail interaction diagrams are quite helpful, but their large size dominated the entire article's page layout. I have moved them to an image gallery, to make them easier to compare with each other, and to make them less disruptive. I suggest making the text labels in the diagrams more
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Thank you Reify-tech, for these points. Usually when someone edits my stuff immediately after I have done a huge redraft, I have negative feelings toward them; in this case, however, I agree with the changes you have made. I'll see if I can make the other changes you mention over the next few
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embedded with the text should relate specifically to the nearby text. Image galleries should be used as appropriate. Any noteworthy or striking images that do not directly relate to a specific section to the text should be relocated to a gallery section, and not embedded randomly in the text.
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I more or less agree with your proposals. The list of accidents is not very informative, and would be better spun off as a separate "List of..." article. The accidents cited in this article should be limited to those that illustrate a specific point being made in the text. Similarly, images
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Practically all of this article is of a dubious technical standard and is written in the style of an enthusiastic amateur. There is plenty of half-truth and true-but-irrelevant material, and it badly needs someone with access to verifiable sources (unfortunately not me) to do something about
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The text is locale-specific in a couple of places, such as saying that "Proper gauge ... is 56.5 inches ... on standard gauge track", "Each rail segment is 39 feet long", and "The wheel rests on an area of rail no larger than a dime in size". This needs to be corrected.
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be detectable because of the traction power return cables along the trackway. My recommendations would be to give emphasis to prediction of rail breakages and to expand the "See also" entry with a link to a more comprehensive treatment at Rail_inspection#NDT_methods.
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It would be interesting to know what was done in case of derailment, how locomotives were rerailed again in the early times of railroading in the 19th century. Did they already have available adequate devices as cranes or similar?
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and end up at an article which says nothing about what a flangeless wheel is, which is very confusing. I don't know enough about the topic to figure out the best way to fix it. --
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the article to fix, I consider globalising the article so that is refers to the global perception of "derailment". Have any questions, no problem, leave them here below!
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I am UK based with some exposure to
Western- and Central-European practice, and also to U.S. practice; any help with internationalising the article would be of value.
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The width of the tread of a standard gauge wheel is about 3 inches (don't quote me!) so the rails have to go only a small amount wide, before you have trouble.
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explanation of the processes and tools. I would do it myself, but lack the specific technical knowledge; I look forward to seeing improved coverage.
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This following parapgraph was cropped from the article's end section. I was unsure how to work this into the article, without references.
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Only one person was killed, the eleven-year-old son of
President-elect Franklin Pierce, who was also on board but was only badly bruised.
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detail -- "bystanders looked on horrified as the packed express train plunged to its doom in the torrent hundreds of feet below" ...
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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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The article is rated as "High-importance", and definitely needs an upgrade in quality. Thanks, Afterbrunel, for initiating it.
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A quick question: The wheel-rail interaction section mentions "tan(L/V)" as an angle, but shouldn't this be "arctan(L/V)"?
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Can reverse curves that are too sharp, including reverse curves in the middle of crossovers, cause derailments?
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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I have now deleted the previously written "example accidents". These were simply cut-and-paste from the article
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To take part in any discussion, or to review a more detailed deletion rationale please visit the relevant
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If the image isn't freely licensed and there is no fair use rationale, then it cannot be uploaded or used.
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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before doing so). The best way to contest this form of deletion is by posting on the image talk page.
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To add to this article: an explanation of what a "journal bearing" and a "journal box" are.
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I have made a start in redrafting this article. (See dubious and non-authoritative above.)
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Arctan? Well yes, you're quite right; what I should have said was not "if tan(L/V) : -->
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If you found an error with any archives or the URLs themselves, you can fix them with
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feel I may have overdone the draconian changes, so it is good to have some support.
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I'll be doing more on this article but as always, anyone is most welcome to help.
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This is Bot placed notification, another user has nominated/tagged the image
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had a pair of flangeless driving wheels which were prone to derailment.
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There is a lot to do to bring this article into an acceptable standard.
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and did not seem to illustrate any of the issues in this article.
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Can scale on the running surface of the wheel cause derailments?
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in the banner shell. Please resolve this conflict if possible.
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This article has been given a rating which conflicts with the
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File:Broken rail derailment.jpg
Nominated for speedy Deletion
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for additional information. I made the following changes:
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If the image has already been deleted you may want to try
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Everyone: ther's still a lot to do -- any help welcome!
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