Rail Transit Track Inspection Practices (2013) / Chapter Skim
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Pages 46-51
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46 Item 3 -- Variation in alignment with a 31-foot cord in tangent: The same principles apply as in Item 2, but using a 31-foot cord instead of a 62-foot cord. (Note that some agencies do not use a 31-foot cord on curves; also note that the middle ordinate offset for a 62-foot cord is not one-half for a 31-foot cord but one-fourth.
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47 Maximum ties in a row vertical alignment. Any given 62 feet of track may not experience more than the allowable "dip" or "hump" in the track.
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48 Item 22 -- Number of ties within 24 inches of the center of a joint: There must be at least one good tie within 2 feet of the rails coming together. This distance is measured from the center of the joint to the center of the tie.
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49 Item 37 -- Frequency of rail flaw detection testing on mainline: APTA has requirements for this and the FRA applies this criteria to freight railroads based on MGT's (million gross tons) and passenger Class 3.
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50 – Establishing a range that causes buckling. – In formulating the procedure the owner shall determine duration of speed restriction based on sufficient stabilization.
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Abbreviations used without definitions in TRB publications: A4A Airlines for America AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACI–NA Airports Council International–North America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers MAP-21 Moving Ahead for Progress in the 21st Century Act (2012) NASA National Aeronautics and Space Administration NASAO National Association of State Aviation Officials NCFRP National Cooperative Freight Research Program NCHRP National Cooperative Highway Research Program NHTSA National Highway Traffic Safety Administration NTSB National Transportation Safety Board PHMSA Pipeline and Hazardous Materials Safety Administration RITA Research and Innovative Technology Administration SAE Society of Automotive Engineers SAFETEA-LU Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (2005)
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