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1.1 This specification covers one-wear, two-wear, and multiple-wear wrought carbon steel wheels for locomotives and cars, designated Classes L, A, B, and C, heat-treated, wheels.
1.2 The service for which the various classes are intended is as follows:
1.2.1 Class B or C wheels shall be used for freight cars in interchange service.
1.2.2 Class B or C wheels are recommended for use on locomotives.
1.2.3 For passenger car service, the various classes are intended generally as follows:
188.8.131.52 Class L—High speed with more severe braking conditions than other classes and light wheel loads.
184.108.40.206 Class A—High speed with more severe braking conditions, but moderate wheel loads.
220.127.116.11 Class B—High speed service with severe braking conditions and heavier wheel loads.
18.104.22.168 Class C—(1) Service with light braking conditions and heavier wheel loads.
22.214.171.124 Class C—(2) Service with heavier braking conditions where off-tread brakes are employed.
1.3 The use of two-wear wheels is recommended for freight car service.
1.4 Supplementary requirements included in Specification A 788/A 788M
1.5 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as the standard. Within the text and tables, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A388/A388M Practice for Ultrasonic Examination of Steel Forgings
A788/A788M Specification for Steel Forgings, General Requirements
SAE DocumentsSAEJ442 Test Strip, Holder and Gage for Shot Peening SAEJ443 Recommended Practice for Procedures for Using Standard Shot Peening Test Strip SAEJ827 Recommended Practice for Cast Steel Shot
Military StandardMIL-S-13165B Shot Peening of Metal Parts Available from Standardization Document Order Desk, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
AAR StandardAARM-107/M-208 Wheels, Carbon Steel Available from Association of American Railroads (AAR), 425 Third Street, SW, Washington, DC 20024, http://www.aar.org.
ICS Number Code 43.040.50 (Transmissions, suspensions)
UNSPSC Code 25171900(Wheels and wheel trims)