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[quote]QUOTE: Originally posted by SROC99 ..."Delayed" and "nondelayed" uncoupling is based on the width of the magnets and not the actual couplers (as "jsp" has incorrectly stated), all Kadee couplers will operate with delayed or nondelayed uncouplers. A magnet that pulls the couplers open enough to uncouple and wide enough to pu***he opposing couplers back together over the magnet and not have them hook up or couple again is called a "Delayed Action" uncoupler. An uncoupling magnet that only opens the couplers just enough to uncouple them and no farther is called a "Nondelayed" uncoupler. Kadees HO #312 uncoupler is our only nondelayed uncoupler and the only difference is that it is narrower than the other magnets...[/quote] I did not realize that there were magnets that were capable of uncoupling, but not delayed uncoupling. I stand corrected on that point. In my defense, there are "coupler clones" (at least in N-scale) that can uncouple over magnets, but don't really do delayed uncoupling, which is why I said that. [quote]QUOTE: ...Using permanent magnets takes a bit of operational learning. The problems most modelers have with them is when they have unwanted slack over the magnets. But if you are willing to find the causes and correct them, then you certainly can use permanent magnetic uncouplers on your mainline as well as anywhere else. Kadee first marketed this system in the late 1950s and thousands of modelers use it without any problems at all...[/quote] I have Kadee underground magnets in my N-scale layout, all but one on the mainline, and they work just fine. I use restraining springs on all cars and make sure they roll smoothly (I don't like an accordion effect, so I'd be fixing that anyway). And as far as underground magnets being "too strong", the magnet strength level was just right once I installed ballast. You do have to strategically place your permanent magnets, though, because if it is in a location where you are constantly reversing direction when you don't want couplers to uncouple, then you will get frustrated. ---jps
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