The proper shipping name of the hazardous commodity as specified by the Code of Federal Regulations, Title 49

Qualifier 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.