20 CFR § 221.3 - Social Security Administration jurisdiction.

The Board transfers jurisdiction (railroad service and compensation credits earned by the employee which the Social Security Administration considers in determining benefits payable) to the Social Security Administration when—

(a) Life and death cases. A living or deceased employee has less than 120 months of service that is creditable under the Railroad Retirement Act; or

(b) Death cases. A deceased employee has at least 120 months of service that is creditable under the Railroad Retirement Act (see part 220 of this chapter) but does not have a current connection with the railroad industry as described in part 216 of this chapter.