in news:200### [at] sticnet Tim Soderstrom
wrote: 

> [...] but this time I was hoping to be able to do things like extrude
> a shape (say an I shaped rail) along a curve for a given
> circumference. Assuming I can do that, I also wanted to place the
> Railroad ties along the curve as well [...]

It's been done for you,

have a look at the end of this page plus download the zip.
http://www.econym.demon.co.uk/isotut/more.htm

or for an alternative:

Newsgroups: povray.binaries.utilities
Subject: Striscia, extruder/lofter
From: ingo <ing### [at] tagpovrayorg>
Message-ID: <Xns94D4AF6BE46A0seed7@news.povray.org>
Date: 23 Apr 2004 11:15:11 -0400
Xref: news.povray.org povray.binaries.utilities:3720

Ingo

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