The Railroad Retirement Act of 1974, referred to in subsec. (a), is act Aug. 29, 1935, ch. 812, as amended generally by Pub. L. 93–445, title I, § 101, Oct. 16, 1974, 88 Stat. 1305, which is classified generally to subchapter IV (§ 231 et seq.) of chapter 9 of Title 45, Railroads. For further details and complete classification of this Act to the Code, see Codification note set out preceding section 231 of Title 45, section 231t of Title 45, and Tables.

1974—Subsec. (a). Pub. L. 93–445 substituted “Railroad Retirement Act of 1974” for “Railroad Retirement Act of 1937”.

1972—Subsec. (c). Pub. L. 92–603 added subsec. (c).

1965—Subsec. (a). Pub. L. 89–97 inserted reference to Railroad Retirement Act of 1937 in first sentence.

Amendment by Pub. L. 93–445 effective Jan. 1, 1975, see section 603 of Pub. L. 93–445, set out as a note under section 402 of this title.

Amendment by Pub. L. 89–97 applicable to calendar year 1966 or to any subsequent calendar year but only if by October 1 immediately preceding such calendar year the Railroad Retirement Tax Act provides for a maximum amount of monthly compensation taxable under such Act during all months of such calendar year equal to one-twelfth of maximum wages which Federal Insurance Contributions Act provides may be counted for such calendar year, see section 111(e) of Pub. L. 89–97.