Cal. Pub. Util. Code § 30703.1
The district may make an irrevocable pledge or contract in connection with the payment of the principal and the interest, sinking or reserve funds, or other obligation of any bonded indebtedness created under this part of any transit funds or other continuing or annual appropriations, contributions, grants, or loans by the United States or any department, instrumentality, or agency thereof, the State of California, a county, a city, or any other public agency, or any other individual or entity, public or private, pursuant to law or this article. The irrevocability of any pledge or contract hereunder shall be binding on the district to the full extent authorized or permitted by the laws governing or applicable to the source of those transit funds, appropriations, contributions, grants, or loans, or by this article. This article shall include, but not be limited to, appropriations or other funds authorized or allocated under Chapter 138 of the Statutes of 1964, First Extraordinary Session, and Chapter 155 of the Statutes of 1966, First Extraordinary Session, or as they may hereafter be amended.
No transit funds, appropriations, contributions, grants, or loans received by the district shall be pledged or by contract be obligated to the payment of any district bonded indebtedness or the principal, interest, sinking or reserve fund payments of that indebtedness unless the pledge or contract is authorized or permitted by the laws governing or applicable to those transit funds, appropriations, contributions, grants, or loans including any official action that may be required of any federal, state, local, or public agency, or any other individual or entity, public or private, and, in the case of incurring indebtedness by the issuance of bonds, the proposition has been approved by 60 percent of those qualified electors of the district voting on the proposition to create the indebtedness at an election called for that purpose pursuant to this part. A vote in favor of the issuance of the bonds shall authorize the use of those transit funds, appropriations, contributions, grants, or loans for those purposes and no other or further elections need be held to authorize the board to collect or provide for the collection of and to make that use of those funds or moneys. The authority to use those funds or moneys shall continue until the bonds and the interest thereon are paid or until a fund sufficient for the payment thereof or of the redemption thereof prior to maturity, with any premiums required therefor, has been created and set aside for that purpose.
"Transit funds," as used in this part, means any funds or moneys payable to or received by the district from any California transit funds or any funds which the United States or any department, instrumentality, or agency thereof, the State of California, a county, a city, or any other public agency, or any other individual or entity, public or private, has or is authorized by any law or by official action thereunder to appropriate, contribute, grant, or loan to the district to be used for the payment of any indebtedness, including, but not limited to, any bonded indebtedness of the district in accordance with this part or any other law.
Ca. Pub. Util. Code § 30703.1