Pub. Util. Code, § 90504

The district may accept, without limitation by any other provisions of this act requiring approval of indebtedness, contributions or loans from the United States, this state, or any department, instrumentality, or agency of either thereof, for the purpose of financing the acquisition, construction, maintenance, and operation of transit facilities, and may enter into contracts and cooperate with, and accept cooperation from, the United States, this state, or any department, instrumentality, or agency of either thereof, in the acquisition, construction, maintenance, and operation, and in financing the acquisition, construction, maintenance, and operation, of any such transit facilities in accordance with any legislation which Congress or the Legislature of the State of California may have heretofore adopted or may hereafter adopt, under which aid, assistance, and cooperation may be furnished by the United States or this state in the acquisition, construction, maintenance, and operation of any such transit facilities. The district may do any and all things necessary in order to avail itself of such aid, assistance, and cooperation under any federal or state legislation now or hereafter enacted. Any evidence of indebtedness issued under this section shall constitute a negotiable instrument.