It gets stranger--I was looking up the trucks listed, Bettendorf Scullin, and Googling that brought me to this: https://www.acyhs.org/newsletter/ACYModeler 2016.pdf Some good modeling advice for these cars. Curiouser and curiouser EDIT: and this: https://acyhs.org/newsletter/ACYHS_News_Spring_Summer_2015.pdf Even has some of our Frisco info!
Thank you Gary for the two links. They are fantastic reading material with great photos. Definitely going to get some for my layout. Joe
In looking back at the diagram with more scrutiny, the diagram does not call out single or double doors, it merely states the opening width. The 3' 11 3/16" is the offset of one side of the opening from the center line.
"Bettendorf Scullin" trucks: Bettendorf style trucks (a wide general category) fabricated by Scullin Steel in St Louis. Ken