Cal. Pub. Util. Code § 103310

The district may accept, without limitation by any other provisions of this part requiring approval of indebtedness, contributions, grants, or loans from any public agency or the United States or any department, instrumentality, or agency thereof, for the purpose of financing the acquisition, construction, maintenance, or operation of transit facilities, and may enter into contracts and cooperate with, and accept cooperation from, any public agency or the United States, or agency thereof, in the acquisition, construction, maintenance, or 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 any public agency 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.