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Richard Hendrickson replies:

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Ned's question carries with it the issue of how one should model stock
cars...cleaned or dirty? In my own case, stock cars leaving Laramie
MT[
which had relatively extensive stock yards...109 pens, 29 chutes
capable of
loading/unloading 760 head of cattle ] would be cleaned. OTOH, the
very
small number of cars leaving sites on Sherman Hill...Hermosa, Red
Buttes,
Sherman and Otto...assuming the number of cars would equate to the
number of
chutes [?], 5 cars in all on Sherman Hill, these would be dirty
since, while
there are water plugs at Red Buttes and Otto, there is no water
facilities
on the Hill for cattle except at the 10 animal capability site of Red
Buttes. So...in my case...most MTs would be cleaned, a small number
not. My
guess is...I'm not gonna notice the difference anyway unless I have
the
doors open. Probably not.

Mike Brock