On Fri, Mar 12, 2021 at 12:47 PM, Dennis Storzek wrote:

Decades ago John Nehrich wanted to call them "bifurcated" ends. But they're really just the standard Dreadnaught pattern as normally seen from the inside.

I don't think that's quite true. Yes, it's quite like an indented dreadnaught end, reversed. But I see a difference in shape of the rib.  On the "innie", the indented shapes are narrow toward the centerline and widen at the ends where they contain the minor darts. The space between tapers like, well, a dreadnaught rib. Flip it inside out, and the indentations become ribs that widen at the ends. I think this pattern shows on some gon ends.

In this photo it appears the ribs have parallel edges and constant width. The flat space between ribs is consequently not tapered. Please chime in, folks. If my interpretation is wrong I'd like to know before I screw it up in O scale.

Jack Mullen