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Cooper Class E10 bridge loading
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<p>The Cooper Rating system applied to timber bridges as well as iron and steel. (It's just a method for estimating live load.)</p><p>Many railroad timber bridges, particularly trestles, were engineered informally, based on experience and standard drawings and details. If a Cooper Rating was ever applied it was only after the fact when someone wondered if the bridge would support a heavier locomotive.</p><p>S, Hadid</p>
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