Re: Curvature Calculator

[wdepot@westerndepot.com (Kevin L. Shelton)]

John Garaty <jkgaraty@1earth.net> wrote:

> All,
> For curvature, most the  "original" survey documents or the NSWGR were
> measured in chains. I suspect that this is also the case for the original
> 3'6" gauge lines in Queensland, Tasmania, South Australia and Western
> Australia. The Victorian 2'6" gauge Colac to Beech Forest track diagram
> shows curves down to 2 chain radius (Reference "The Beechy" by N Houghton
> pages 4 & 5). Most narrow gauge railways (2') quote radius in either feet or
> metres.  These days metres are used as the dimension for curvature radius in
> Australia. In the US (Ever read articles in Trains, Railfan and Railroad?
> etc) curvature is quoted as a percentage.
> 
Actually, curvature in the US is normally expressed in degrees. It's
grades that are expressed in percentages.
 
> Have fun regards, John Garaty
> 
> David Johnson <trainman@ozemail.com.au> wrote in message
> news:38F9B4CC.8129E732@ozemail.com.au...
> > Bob May wrote:
> >
> > > I'd give a bit of descriptions on the page, drop the chain calculation
> > > (as others have said, it is pretty esoteric and subject to mistakes in
> > > the length of the chain)
> >
> > I will put descriptions in, but not drop the chain radius.  In Australia,
> all
> > our curve and gradient diagrams give radius in chains.  This was one of
> the main
> > reasons for making the calculator in the first place.
> >
> > --
> > David Johnson
> > trainman@ozemail.com.au
> > http://www.ozemail.com.au/~trainman/
> > ------------------------------------
> > These comments are made in a private
> > capacity and do not represent the
> > official view of State Rail.
> > C.O.W.S. Page 11.
> >
> >


-- 
The Western Depot invites you to visit its web site:
http://www.westerndepot.com/