Tax exemption for Railway Sports Promotion Board conditioned on exclusive application of income and compliance with investment and accounting rules. Notification recognizes the Railway Sports Promotion Board as eligible under clause (23) of section 10, provided it applies or accumulates income exclusively for its objects per Section 11 as modified; restricts investments to forms under Section 11(5); prohibits distribution of income to members except grants to affiliated bodies; and excludes business profits unless incidental to objectives with separate books maintained.