The proper shipping name of the hazardous commodity as specified by Title 49 Code of Federal Regulations, or the shipping name of the dangerous good as defined in the Canadian Transportation of Dangerous Goods Act and Regulations, or the international regulations as promulgated by the United Nations

Code indicating the source (regulatory) of the proper shipping name

Code indicating the type of regulatory requirements that apply to a description; N.O.S. stands for Not Otherwise Specified

Code indicating a Yes or No condition or response

If LH304 is "Y", then this is an Association of American Railroads Operations and Transportation Bulletin 55 commodity. If "N", it is not an Association of American Railroads Operations and Transportation Bulletin 55 commodity.