Z-channel! CB&Q used Z-channel instead of hat channel for framing single-sheathed boxcars.
Still a sticking point after 50 years!!! I got into N Scale when I realized that even Northeastern Z-channel was too big to scratchbuild the stock cars, boxcars, and gons I would need to model the CB&Q properly...on the theory that nobody in their right mind would ever attempt to model a prototype in N.
That was back in the days before fabricating fine structural shapes out of styrene was not an option and RP production of entire carbodies wasn't even a dream.
