Cal. Pub. Util. Code § 29235

(a) The district may borrow money for the purchase of transit vehicles, as defined in subdivision (b) of Section 99501, transit equipment, or transportation facilities, or for capital improvements, by the issuance of grant anticipation notes issued pursuant to Article 7.7 (commencing with Section 53859) of Chapter 4 of Part 1 of Division 2 of Title 5 of the Government Code payable on the basis of any of the following:
1. (1) From appropriated state funds.
2. (2) From other funds committed, but not appropriated, and evidenced by an appropriate document of intent.
3. (3) On specific dates or events and evidenced by an appropriate document of intent. There shall be no liability on the state for funds appropriated but not allocated.
(b) In addition to the grant money that may be pledged for the payment of the notes pursuant to Section 53859.06 of the Government Code, the district may pledge as security, on terms that it deems appropriate, the transit vehicles or equipment, transportation facilities, or capital improvements acquired with the proceeds of the notes.