CFR > Title 20 - Employees' Benefits > CHAPTER II—RAILROAD RETIREMENT BOARD > SUBCHAPTER B—REGULATIONS UNDER THE RAILROAD RETIREMENT ACT (parts 201 to 295) > PART 225—PRIMARY INSURANCE AMOUNT DETERMINATIONS > SUBPART D—Delayed Retirement Credits (§225.30 to §225.36) > 225.32—DRC's and the Special Minimum PIA.