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- Newsgroups: rec.railroad
- Path: sparky!uunet!uunet.ca!wildcan!sq!msb
- From: msb@sq.sq.com (Mark Brader)
- Subject: Re: High Speed Rail Questions
- Message-ID: <1992Dec30.111138.13065@sq.sq.com>
- Organization: SoftQuad Inc., Toronto, Canada
- References: <1992Dec30.040339.1565@ee.ryerson.ca> <6216@naucse.cse.nau.edu>
- Date: Wed, 30 Dec 92 11:11:38 GMT
- Lines: 40
-
- > > > Nowadays they weld it at rail welding plants into long
- > > > strings that are transported on special cars. It looks real strange
- > > > to see a welded rail train going around a curve. Just shows how
- > > > flexible rail really is.
- > >
- > > Correct me if I'm wrong, but I understood that rail is "rolled" from
- > > the steel mills in 1/4 mile length right onto the special cars ...
- >
- > The cars themselves look like fairly normal length,
- > but the rail just runs out the end of one car and into the end of the
- > next one down, above the coupler.
-
- I don't know who's right about how the 1/4 mile lengths are manufactured
- -- maybe both people -- but I do have a tidbit to add about the trains.
-
- On May 31, 1965, there was a major pileup on the Southern Railway near
- Greenville, SC, USA. A train pulled by 5 locomotives collided with a
- bulldozer. In this train was a sequence of 30 flatcars, which were
- carrying a load of rails 700 feet long. I have at hand a picture of
- the wreck, and the rails are curved rather spectacularly into a series
- of S bends, with bogies and loose axles all over the ground.
-
- The picture was printed in Scientific American in June 1966 in an article
- on "River Meanders", by Luna B. Leopold and W. B. Langbein; this article
- was reprinted in 1979 in a book of Scientific American articles called
- "The Physics of Everyday Phenomena" (W. H. Freeman & Co., ISBN 0-7167-
- 1125-7, paperback 0-7167-1126-5).
-
- The reason it's in there is that the springy rails, or a simple piece
- of springy metal that you hold bent in an S curve, or the meanders of a
- river, are all approximations to the same curve. It is called a "sine-
- generated curve", and it has the property that if you travel along it
- and plot your instantaneous direction of travel against the distance you
- have come, then you get a sine wave. For the reasons, see the article.
- --
- Mark Brader | "...not one accident in a hundred deserves the name.
- SoftQuad Inc., Toronto | [This occurrence] was simply the legitimate result
- utzoo!sq!msb, msb@sq.com | of carelessness." -- Washington Roebling
-
- This article is in the public domain.
-