Here is the file (3ds format)

http://www.verzend.be/v/2443774/Rail.zip.html

How is this?

Thanks for the reply and the tips.

well, if I find the time I might try and make you those rails.  Should be dirt simple to make something simple and moderately close.  May not your final rail, but something to tide you over.  Have a prefered format? OBJ?

the ground is much too smooth and shiny.  A litte more lively texture and a bump map would make the image much more interesting.

I'm guessing the image is supposed to be at night.  But, it is very bright.  Also, the light is very hard edged.... a little fuzzy would be better. 

Would you mind sharing how you did the amazingly good smoke in that image?

It is very well done.  I have recently been unable to make decent smoke / clouds.  I looked at several of my older images and can not duplicate the effects I once made.  I lost the BR5 files to a disk failure.  So I can't load those back up.

I remembered vaguely reading the Brycetech tutorial, and tried to follow it... but I hit what seems to be a bug in 5.5c with volumetrics.  The spheres are not touching each other but are still erasing bits if each other.

I posted on the Bryce forums at Daz and got two helpful replies,  but neither seem to produce the results I once got which were similar to yours.

http://forum.daz3d.com/viewtopic.php?t=45700