Tax exemption recognition under clause 23C(iv) granted subject to income application, investment, business, filing, and dissolution conditions. The Central Government notifies the Institute of Rail Transport as eligible under clause (23C)(iv) of section 10 for assessment years 2002-03 to 2004-05, subject to conditions requiring application or accumulation of income exclusively for its objects; restricted investments to modes specified in section 11(5) except certain voluntary contributions; exclusion of business income unless incidental and separately accounted; regular filing of income-tax returns; and transfer of surplus and assets on dissolution to a charitable organisation with similar objectives.