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In response to various petitions for rulemaking submitted by the regulated community, this rulemaking action would amend the Hazardous Materials Regulations (HMR; 49 CFR parts 171-180) to reduce regulatory burdens while maintaining or enhancing the existing level of safety. These changes have been identified as deregulatory in nature and would provide a cost savings to industry. Specific examples include amending the HMR to adopt a phase-out schedule for certain tank cars used to ship chlorine by rail; revising section 172.302(b)(2) for consistency with section 172.326(a) and the International Maritime Dangerous Goods (IMDG) Code 5.3.2.0.2, to allow a minimum height of 12 mm (0.47 inches) for a proper shipping name marked on a portable tank that has a capacity of less than 3,000 L (792.52 gallons); revising section 173.5b to allow for the continued use of certain Portable and Mobile Refrigerator Systems thus providing significant regulatory relief to agricultural producers and related post-harvest precooling industry entities; and permitting the import of filled pi-marked foreign pressure receptacles for intermediate storage, transport to point of use, discharge, and export without further filling, as well as the import of certain pi-marked foreign pressure receptacles for filling, intermediate storage, and export. Additionally, this rulemaking action would amend the HMR and respond to petitions that are identified as deregulatory in nature and which would provide a cost savings to industry.