Reply to "Kadee vs Atlas couplers"

Jeff78rr posted:

I also use the 740's over anything else. I like the metal gearboxes on the 740 over the 745's plastic boxes. The couplers are the exact same...

Jeff,   One problem I’ve experienced using the plastic boxes (Kadee 80?) was the propensity for the couplers on the cars up front (30 cars) to move vertically under high stress (Going uphill) sometimes resulting in separation.  While strict attention to proper height has eliminated the separation problem, some couplers still move vertically under stress resulting in some cars having only half the knuckle engaged.  Is there better vertical control using metal boxes?

Thanks