Gunderson, the makers of Husky & Maxi-Stack twin stack intermodal cars, Multi-Max & AutoMax auto carriers, covered hoppers that look like the Atlas-O Trinity cars, tank cars that look like the Atlas-O 25,500 vegetable oil cars has a free Pdf book, describing their history at their website. The second half of the book contains interesting information about the railroad freight cars they developed.
https://www.gbrx.com/files/files/GundersonBook.pdf
Thanks,
Naveen Rajan
