These categories are those defined in the regulations concerning the international carriage of dangerous goods by rail, usually known as the RID, as adopted under Directive 2008/68/EC of the European Parliament and of the Council.
Is éard atá sna catagóirí seo na catagóirí a shainítear sna rialacháin maidir le hiompar idirnáisiúnta earraí contúirteacha d'iarnród, ar a dtugtar RID de ghnáth, arna nglacadh faoi Threoir 2008/68/CE ó Pharlaimint na hEorpa agus ón gComhairle.