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A type of parameter that describes the allowed axle load and is expressed either in tons per axle (as an integer or with one decimal), or in tons per metre (t/m, linear metre, generally with one decimal). Together they define the so-called track class or categories (defined in the UIC classification), denoted by letters and numerals as A, B1, B2, C2, C3, C4 etc.; the most common one is Class D.
Example: the track class C3 defines the allowable axle load of 22,5 t per axle and 7,2 t/m.
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