20 C.F.R. § 216.53
What is required for payment
An eligible spouse or divorced spouse must:
(a) Apply to be entitled to an annuity; and
(b) Give up the right to return to work for a railroad employer.
An eligible spouse or divorced spouse must:
(a) Apply to be entitled to an annuity; and
(b) Give up the right to return to work for a railroad employer.