49 CFR §242.211

1. (a)A railroad shall have a system for the prompt replacement of lost, stolen or mutilated certificates at no cost to conductors. That system shall be reasonably accessible to certified conductors in need of a replacement certificate or temporary replacement certificate.
2. (b)At a minimum, a temporary replacement certificate must identify the person to whom it is being issued (including the person's name, identification number and year of birth); indicate the date of issuance; and be authorized by a designated supervisor. Temporary replacement certificates may be delivered electronically and are valid for a period no greater than 30 days.