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1.1 This specification covers seven classes of carbon steel tires for railway and rapid transit use.
1.1.1 Class A -For untreated driving tires for locomotives in passenger service.
1.1.2 Class AHT -For heat-treated driving tires for locomotives in passenger service.
1.1.3 Class B -For untreated driving tires for freight locomotives and tires for locomotive-truck, tender-truck, trailer and car wheels, and miscellaneous service.
1.1.4 Class BHT -For heat-treated driving tires for freight locomotives and tires for trailer wheels.
1.1.5 Class C -For untreated tires for switching locomotives.
1.1.6 Class CHT -For heat-treated driving tires and switching locomotives and tires for locomotive-trucks, tender-trucks, trailer and car wheels, and miscellaneous service.
1.1.7 Class DHT -For heat-treated driving tires for locomotives with light braking conditions, heavily loaded trailer tires, and car wheels where off-tread brakes are employed.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
ICS Number Code 45.040 (Materials and components for railway engineering)
UNSPSC Code 81101511(Railway engineering)