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The question now is no longer KD, but should it be the 5's or 58's? so now the issue could become just a little confusing. The 58 has a smaller coupler head/face and closer to scale but? Here' a site . http://www.nmra.org/beginner/couplers.html The #5 mates well with the #58 BUT the 58 does not come in any other series , 20-30-40 series. These series include the underset and overset couplers should your locos/cars require a special fitting coupler. These series includes different shank lengths & head heights When a #58 coupler is mated with a underset or overset on less than perfect track, this larger head coupler may climb right out of the 58. The height of the #5 knuckle and the off sets is .250" and the #58 knuckle is.210" , just enough to uncouple on un-even track or at the crest of a grade.
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