Under Section 2(e)(2) of the Railroad Retirement Act, the Railroad Retirement Board must have evidence than an annuitant for an age and service, spouse, or divorced spouse annuity has ceased railroad employment and relinquished their rights to return to the service of a railroad employer. The collection provides the means for obtaining this evidence.
The latest form for Certification of Termination of Service and Relinquishment of Rights expires 2021-01-31 and can be found here.