National Railroad Retirement Investment Trust (NRRIT) is a defined contribution union pension fund based Washington, District of Columbia. Established in 2002, the sole purpose of NRRIT is to manage and invest railroad retirement assets. The trust is authorized to invest the assets of the railroad retirement account in a diversified investment portfolio in the same manner as those of private-sector retirement plans. The assets are managed by the Board of Trustees comprising of seven trustees, with railroad labor unions and railroad companies each selecting three and the seventh is the independent trustee.