Cal. PUC § 29080

The district may accept, subject to the procedures and limitations provided in Chapter 8 of this part, contributions or loans from the United States, or any department, instrumentality, or agency 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, or any department, instrumentality, or agency thereof, in the acquisition, construction, maintenance, and operation, of any such transit facilities in accordance with any legislation which Congress may have heretofore adopted or may hereafter adopt, under which aid, assistance, and cooperation may be furnished by the United States in the acquisition, construction, maintenance, and operation or in financing 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 legislation now or hereafter enacted. Any evidence of indebtedness issued under this section shall constitute a negotiable instrument.