[Code of Federal Regulations] [Title 20, Volume 1] [Revised as of April 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 20CFR228.2] [Page 449-450] TITLE 20--EMPLOYEES' BENEFITS CHAPTER II--RAILROAD RETIREMENT BOARD PART 228_COMPUTATION OF SURVIVOR ANNUITIES--Table of Contents Subpart A_General Sec. 228.2 Tier I and tier II annuity components. (a) Tier I annuity component. The Tier I annuity component is generally the amount that would have been payable under the Social Security Act if all of the employee's earnings after 1936 under both the railroad retirement system and the social security system had been creditable under the Social Security Act. [[Page 450]] (b) Tier II annuity component. The tier II annuity component is the portion of the survivor's annuity which is based on an employee's railroad earnings only. The tier II component of an annuity described in this part is a specified percentage of the employee's actual or anticipated tier II annuity component.