1.1This specification covers carbon steel girder rails2 of three classes based on type or type and weight, and chemistry defined as follows and in Table 1.
| Class A | Class B | Class C | |
| Carbon | 0.60-0.75 | 0.70-0.85 | 0.75-0.90 |
| Manganese | 0.60-0.90 | 0.60-0.90 | 0.60-0.90 |
| Phosphorus, max | 0.04 | 0.04 | 0.04 |
| Silicon | 0.10-0.40 | 0.10-0.40 | 0.10-0.40 |
1.1.1Unless otherwise specified by the purchaser, girder-guard rails shall be Class A.
1.1.2Plain and grooved-girder rails under 135 lb/yd (67.1 kg/m) in weight shall be specified by the purchaser as either Class A or Class B.
1.1.3Plain and grooved-girder rails of 135 lb/yd in weight and heavier shall be Class C, unless otherwise specified.
1.2The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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