Remember William, 07407 was made from a steel underframe C&S stock car (I see Dave has already pointed that out) so had "regular" draft gear from the start. Still that spring is a real mystery, more on that here:
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ngdiscussion.net]
But back to Earl's point, office car 04982 at Chama 2.5 years ago:
Again, not being a draft gear expert, this doesn't look quite like the Miner gear that I'm used to seeing, and the extra center sills are certainly present in the last shot. Whether this arrangement is at all still functional I have no idea, but it seems reasonable to assume the continuous rod is still there.
I had always assumed that when they went to automatic couplers that it was Miner gear and that the continuous rod was exclusively associated with link and pin. Guess not! Infinitely fascinating, learn something new everyday!
Could this arrangement have been widely prevalent on other cars between safety updates (1915ish) to the 20's rebuilds?
Mike