Sergent couplers, tight radius, long cars

I stumbled on a discusson on the Atlas forum regarding the possibility that Sergent Couplers would cause cars to derail on tight radius curves, based on their tigher lock and shorter shanks than the Kadee couplers.

I realized that I had the perfect setup to test this on - an 18-inch radius reverse loop that is entered from one end with a short s-curve. Pretty much guaranteed to stress out a coupler. So I set up a train using some of my Walther's 72" centerbeams w/swivel draft boxes, some LBF woodchip gondolas with fixed draft boxes, and a couple other random cars stuck in it.

Here is what happened:

All in all a good test - and the Sergents appear to work fine. Just don't try to NASCAR it around tight radius curves.