1.1 This specification covers carbon steel girder rails of three classes based on type or type and weight, and chemistry defined as follows and in Table 1. 1.1.1 Unless otherwise specified by the purchaser, girder-gua This specification deals with carbon steel girder rails of plain, grooved, and guard types. Materials considered in this specification are grouped into three classes (Class A, B, and C) based on type, weight, and chemistry (carbon, manganese, phosphoru