that's right.  at the speeds old trains moved, the upward force of the
smoke was enough to have the stream go straight up for a short
distance.  in fact, the backward movement of the smoke was mostly only
perceptual.  what really happened was the smoke would shoot up, and the
train would move along, leaving a trail behind it.  of course, wind had
an effect on smoke travel, but only after the above considerations.

Chris Huff wrote:
> 
> The smoke definitely needs work...more transparence, and more spheres
> should help. Maybe also fade_distance, and you will need to increase
> max_trace_level.
> Also, they should come out of the funnel in an upward jet, not just
> trickling out, and it would help if they came from an area, not a single
> point, so it looks like the smoke is blowing out of the funnel.
> 
> --
> Christopher James Huff - Personal e-mail: chr### [at] maccom
> TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
> Personal Web page: http://homepage.mac.com/chrishuff/
> TAG Web page: http://tag.povray.org/

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