After reading this thread, I took note of the couplers on a passing train recently. There were only a few, maybe less that ten, couplers that did not have shelves. I was surprised how many double shelves couplers there were. I recall when the single shelf coupler first came out, McConway Torley advertised that if everyone used single shelf couplers, double shelf couplers would be unnecessary. They felt so strongly about this that the sold the single shelf coupler at the same price that they sold the E60 for.
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