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National Transportation Safety Board

By National Transportation Safety Board

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Book Id: WPLBN0000702954
Format Type: PDF eBook
File Size: 3,277,035 KB.
Reproduction Date: 2006
Full Text

Title: National Transportation Safety Board  
Author: National Transportation Safety Board
Volume:
Language: English
Subject: Government publications, Transportation and society, National Transportation Safety Board (U.S.)
Collections: National Transportation Safety Board Collection
Historic
Publication Date:
Publisher: National Transportation Safety Board

Description
Government Reference Publication

Excerpt
Excerpt: Factors in TamaroaRail Failure Factors in Tamaroa Rail Failure: // Bond wire welds created brittle steel (untempered martensite) // Decreased track support (soft ballast) // Location of bond wire welds // Conclusion: // The known soft ballast condition in the area of the insulated joint increased the amount of rail flexing in that area which, in turn, significantly increased stresses in the rail. // Conclusion: // The increased stresses due to the flexing of the rail in the area of the insulated joint caused the propagation of the cracks that had originated in areas of untempered martensite at the rail head, causing the rail to fail only 17 days after installation.

 

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