49 CFR §240.1

1. (a)The purpose of this part is to ensure that only qualified persons operate a locomotive or train.
2. (b)This part prescribes minimum Federal safety standards for the eligibility, training, testing, certification and monitoring of all locomotive engineers to whom it applies. This part does not restrict a railroad from adopting and enforcing additional or more stringent requirements not inconsistent with this part.
3. (c)The locomotive engineer certification requirements prescribed in this part apply to any person who meets the definition of locomotive engineer contained in § 240.7, regardless of the fact that the person may have a job classification title other than that of locomotive engineer.