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Here is how I understand the magnetic poles need to be aligned for the magnetic uncoupling to work.Since the magnetic field is weak between the poles (in the center of the magnet), the trip pins are attracted to the poles. I can't visualize how Bryan uses 2 magnets.
End-to-end with the poles oriented in the same direction, essentially making a 1/2" x 2" magnet. 1" is too small a target for reliable uncoupling.
... Two-inch-long magnets make it more difficult to manipulate shorter cars (such as 33' twin hoppers) without additional uncouplings between adjacent cars.