20 C.F.R. § 255.13
Example (1). After being informed by the Board that he had been credited with sufficient years of railroad service to retire at age 60, an employee quit his railroad job and applied for benefits under the Railroad Retirement Act. He receives benefits for six months when it is discovered that he had insufficient railroad service to retire at age 60 and was not entitled to the benefits he received. His annuity was terminated. Because the employee gave up his seniority rights when he quit his railroad job, he cannot get his job back. It is determined that the employee was not at fault in causing the overpayments. In this situation recovery of the overpayment would be against equity or good conscience because the overpaid individual gave up a valuable right.
Example (2). A widow, having been awarded annuities for herself and her daughter, entered her daughter in a private school. The widow did not have substantial assets and her income, apart from the annuities she received in the amounts payable, would not have been sufficient for her to have undertaken the obligation to send her daughter to private school. In order to pay for the schooling she took out a loan and used the monthly annuities to pay interest and principal on the loan. After the widow and her daughter had received payments for almost a year, the deceased employee was found not to have been insured under the Railroad Retirement Act. Therefore, all payments to the widow and child were erroneous and the annuities were terminated. It is determined that the widow was not at fault in causing the overpayment. Having incurred a financial obligation (the school loan) toward which the benefits had been applied, the widow was in a worse position financially than if she and her daughter had never been entitled to benefits. In this situation, the recovery of the overpayment would be against equity or good conscience.
20 C.F.R. §255.13