Section 240.209 - Procedures for making the determination on knowledge(a) Each railroad, prior to initially certifying or recertifying any person as an engineer for any class of train or locomotive service, shall determine that the person has, in accordance with the requirements of § 240.125 of this part, demonstrated sufficient knowledge of the railroad's rules and practices for the safe operation of trains.(b) In order to make the determination required by paragraph (a) of this section, a railroad shall have written documentation showing that the person either: (1) Exhibited his or her knowledge by achieving a passing grade in testing that complies with this part; or(2) Did not achieve a passing grade in such testing.(c) If a person fails to achieve a passing score under the testing procedures required by this part, no railroad shall permit or require that person to operate a locomotive as a locomotive or train service engineer prior to that person's achieving a passing score during a reexamination of his or her knowledge.56 FR 28254, June 19, 1991, as amended at 74 FR 68184 , Dec. 23, 2009; 85 FR 81314 , Dec. 15, 2020