This photo-sequence shows the Dingham Autocoupler in action. The photos actually show the 4mm coupler but the 7mm version works in exactly the same way.
Note that there is no need for the vehicles to be stationary to uncouple. If a string of wagons is propelled over an uncoupling magnet any or all of the wagons can be uncoupled by energising the magnet as the required coupler passes over it. The sequence pictured in photos C, D and E will take place “on the fly”. Despite the couplers being "handed", uncoupling will take place when the train is propelled in either direction over an energised magnet.
When bringing a passenger train into a terminus station, the locomotive can be released to run round in a most realistic manner. The train is stopped with the rear loco buffers over an appropriately placed uncoupling magnet. The loco is then reversed about 2mm, to buffer up to the train – an entirely prototypical movement that is required to allow the screw coupling to be unhooked. If the electromagnet is now briefly energised, latched uncoupling will occur and the loco can be drawn away from the train at any time.
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