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Weighting Freight Cars for Better Performance: NMRA Standards, Practical Methods, and Tracking Tips Reliable operation is what turns a loop of track into a railroad. If you’ve ever watched a freight car “hunt” side-to-side, stringline on a curve, tip outward on a superelevation, or derail for no obvious reason, there’s a good chance the culprit isn’t your locomotive—it’s the car. Weighting freight cars is one of the simplest, most powerful upgrades you can make for smoother switching, fewer der …