United States Department of Transportation
i
Portable track loading fixture improvement.
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2012-12-01
[PDF-415.68 KB]
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NTL Classification:NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION
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Abstract:The portable track loading fixture (PTLF) has been used in the field as a nondestructive means of testing track strength, as per the Federal Railroad Administration’s (FRA) Track Safety Standards (TSS) 49 CFR §213.110 (m). The PTLF operates by placing a 4,000-pound-force (lbf) lateral load as close to the shear center of the rails as possible, while the deflection at the gage point is measured. Gage is measured as the lateral distance between the 5/8” points on the two rails below a plane formed by the top of the rails. If measurement is conducted at the web of the rails, it is known as web gage. Although it is widely accepted that rail deflection caused by the PTLF loading has a strong correlation with track strength, repeatability of measurements has been a concern. It has been observed that some locations, which exceed the displacement criteria on initial loadings, are within the limits on subsequent loadings. As a result of these variations, the reliability of the PTLF test has been questioned in the past.
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