Here are some links I have found on Google. There are other websites, I'm sure.
First is a discussion in this forum last year.http://www.trains.com/trccs/forums/915362/ShowPost.aspx
http://www.btcomm.com/trains/primer/o_gauge_outside/o_gauge_outside.htm
http://www.dreammachinestrains.com/6Ogardennew.html
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