CFR > Title 20 - Employees' Benefits > CHAPTER II—RAILROAD RETIREMENT BOARD > SUBCHAPTER B—REGULATIONS UNDER THE RAILROAD RETIREMENT ACT (parts 201 to 295) > PART 220—DETERMINING DISABILITY > SUBPART N—Trial Work Period and Reentitlement Period for Annuitants Disabled for Any Regular Employment (§220.170 to §220.171)