49 U.S.C. § 328 — Transportation Systems Center working capital fund

(a) The Department of Transportation has a Transportation Systems Center working capital fund. It pays for the Center's activities — research, development, testing, evaluation, analysis, and related work the Secretary approves — done for the Department itself, other agencies, state and local governments, other public authorities, private organizations, and foreign countries. (b) Money in the fund doesn't expire at the end of a fiscal year, and Congress can appropriate more into it. (c) The fund's starting capital comes from: money appropriated to it; the Center's net assets as of October 1, 1980, including advances for valid obligations made before that date; the value of property and other assets transferred to the fund after September 30, 1980 (minus related debts); and the value of property and assets donated to the fund. (d) The fund gets reimbursed or credited from: advance payments from the Department's or other agencies' funds, or from other sources the Secretary allows, covering the cost of services (including accrued leave and overhead) and the cost of buying property and equipment under the Secretary's rules; and money from selling or trading property, or from payment for lost or damaged fund property. (e) At the end of each fiscal year, the Secretary must deposit any fund money the Secretary decides is more than the fund needs into the Treasury as miscellaneous receipts.