White and Black Smoke

NW Mailing List nw-mailing-list at nwhs.org
Sat Mar 29 08:26:40 EDT 2008


Good morning.

I am not worried about my Arrow not arriving yet and will not be posting when it arrives.

The purpose of my post this morning is to inquire as to why on many of the programs that I watch on RFD TV (Trains and Locomotives) some of the smoke is black and some is white. What is the cause of this? Have a great weekend and thank you in advance for any responses.
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