Speeder3 Wrote:
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> I think you are referring to the rule about
> coupling a passenger car to a freight car equipped
> with shelf couplers. Couplers with a cast
> extension on top and bottom, to stop the
> possibility of vertical separation, are used on
> tank cars in hazardous material service. I don’t
> think the tank car in the photo was so equipped.

That is correct, i.e. that tankcar did NOT have "shelf couplers". In fact, that was the tankcar which was used for Diesel engine crankcase oil drainings from the host railroad's diesel shop. The tankcar was then moved to the Brooklyn Roundhouse where the used oil was pumped into 4449's tender for fuel. In the photo, the tankcar was brought along in order to refuel 4449 during the operations. There was NO interference with the diaphragm on the "Yes Dear" crew car.