49 C.F.R. § 240.225
(a) A railroad that is considering certification of a person as a qualified engineer may rely on determinations made by another railroad concerning that person's qualifications. The railroad's certification program shall address how the railroad will administer the training of previously uncertified engineers with extensive operating experience or previously certified engineers who have had their certification expire. If a railroad's certification program fails to specify how to train a previously certified engineer hired from another railroad, then the railroad shall require the newly hired engineer to take the hiring railroad's entire training program. A railroad relying on another's certification shall determine that:
[64 FR 60993, Nov. 8, 1999, as amended at 74 FR 68184, Dec. 23, 2009]