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I understand. According to the article in the December 2003 Model Railroader 70 ton freight truck will only support 70 tons for the entire car, not just for that particular truck. So you couldn't put a 70 ton truck on a 220,000 gr. wt. car, it wouldn't be rated high enough. You'd have to put 110 ton trucks on them, or else, put 100 ton trucks and limit the load to 200,000 pounds. However, I'm not sure you got the focus of my question. I understand the weight figures on the sides of the cars, but what I'm asking is how do they determine that car # 12345 has a lt.wt. of 70,000 pounds, while car # 12346 has a lt.wt. of 68,000 pounds, even though they're both identical in appearance. Who makes that determination, the manufacturer or the railroad? If the manufacturer makes the determination, what happens if the railroad takes it in for service and has to refurbish it - how do they know its lt. wt. or is it an estimate with a fairly accurate guess?
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