. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . Fig. 2.—Cross section of rail near receiving end. Split head frac-ture had approached within three-eighths inch of gauge side ofthe head. Surface polished and etched with tincture of borders of fracture not significant. strains, and lead to the formation of a split head frac-ture. The examination was next directed to some dark linesnear the upper surface of one of the flanges, marked foridentification with an arrow, on Figure 2. An inter-. Fig. 3.—Photomicrograph of darkened spot
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . Fig. 2.—Cross section of rail near receiving end. Split head frac-ture had approached within three-eighths inch of gauge side ofthe head. Surface polished and etched with tincture of borders of fracture not significant. strains, and lead to the formation of a split head frac-ture. The examination was next directed to some dark linesnear the upper surface of one of the flanges, marked foridentification with an arrow, on Figure 2. An inter-. Fig. 3.—Photomicrograph of darkened spot near center of head ofrail. Transverse section, 100 diameters magnification rupted line of minute slag inclusions was the character-istic feature of this streak in the metal. It is believed that the slag streak in the head was re-sponsible for the accident, and the examination of thesespots furnish an illustration believed to represent a struc- tural condition adequate to cause the development of asplit head, provided it was located in the critical zone inthe head. In the base it was not situated in a danger zoneind its presence there can be ignored. The last remark brings to notice the feature that struc-tural conditions to be menacing must occupy certaindefinite danger zones in the cross section of the rail, andthat vulnerability is found in certain localities with whichthe intensity of wheel pressures bear a definite relation. It is believed that seams, such as these, if present inthe head, critically located and oriented, would lead tothe
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
