I found a very informative "Modeler's Guide to Freight Car Trucks", thought others might like to add it to their files.
http://www.trains.com/mrr/objects/pdf/mr_pi_5-06_freightcartrucks.pdf
There's a plethora of information at Trains.com, the trick is searching to find a particular article. I spent an hour searching for the article on "Banishing Derailments", then remembered PD had it in his files.
If you find a helpful article, feel free to add the link in this thread. Please limit articles to PDF files , or pages that offer PDF files, which are easily saved.
I have over 300 PDF files, organized by category on a flash drive. I renamed most of them for easy recall.
Thanks, and enjoy.
Ok, that was a great read. Thanks.