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If you model in HO, the more likely culprits are <br />1) truck-mounted couplers or 2) the so-called "NMRA" couplers. Either one can cause a derailment when backing. Convert to body-mounted Kadees and the problem will most likely disappear. If you model in N, again, the issue may be truck-mounted couplers. I would not try solving the problem with weights unless it is the last resort. <br /> <br />John Timm
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