Section 219.1 - Purpose and scope(a) The purpose of this part is to prevent accidents and casualties in railroad operations that result from impairment of employees by alcohol or drugs.(b) This part prescribes minimum Federal safety standards for control of alcohol and drug use. This part does not restrict a railroad from adopting and enforcing additional or more stringent requirements not inconsistent with this part. 66 FR 41973 , Aug. 9, 2001, as amended at 81 FR 37922 , June 10, 2016