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This Hazardous Materials Guidance document discusses the calculations that can be used to determine whether or not a material meets the poison-by-inhalation requirements of 49 CFR 173.132.

The purpose of this Hazardous Materials Guidance Document is to provide FRA’s interpretation of 49 CFR §§ 172.336(c) and 172.504 as they pertain to the marking and placarding of multi-compartment and articulated tank cars.

The purpose of this Hazardous Materials Guidance Document is to define “Luting Materials.”

This Hazardous Materials Guidance document explains FRA interpretation of the terms locomotive “dead-in-tow” and “occupied caboose.”

The following provides guidance regarding the Office of Safety’s policy on the return shipments of

The purpose of this HMG is to explain the requirements of fumigated containers received by rail carriers from ocean carriers.

The purpose of this Hazardous Materials Guidance Document is to explain several changes, effective June 1, 2005, to the hazardous materials regulations (HMR) concerning tank car loading, unloading, and storage.

This Hazardous Materials Guidance discusses the inspection and enforcement requirements for hazardous materials security plans and training required by the Pipeline and Hazardous Materials Administration’s final rule in docket HM-2321

This HMG also provides contact personnel who are responsible for the various security plans and reiterates the question and answers which were contained in the original guidance document.

The purpose of this Guidance is to clarify issues surrounding AAR (Association of American Railroads) Class 207 cars.

NOTE: This guidance annuls and replaces former HM-09 and HM-94-06

The purpose of this Hazardous Materials Guidance is to clarify the train placement rules in 49 CFR § 174.85 that allow “specially equipped cars with tie-down devices for securing vehicles” to be entrained next to placarded rail cars transporting Divi

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