Originally Posted by Fire21
Mopac and prrfan, thank you! As I said, I'd seen the term many times, but never bothered to explore it. I appreciate your simple explanation and the links to photos. [IMG class=inlineimg]https://www.modeltrainforum.com/images/smilies/smilie_daumenpos.gif[/IMG]
You’re welcome, Fire 21. I hope NS gets them all together at Spencer, NC again some day. Missed it last time since I was in NY but much closer now.