Cal. Pub. Util. Code § 99262

Claims for public transportation systems may include claims for money for all purposes necessary and convenient to the development and operation of the system, including planning and contributions to the transportation planning process, acquisition of real property, construction of facilities and buildings, purchase and replacement of vehicles (including those usable by disabled persons), and system operation, maintenance, and repair, payment for any of which purposes may take the form of direct expenditures or payment of principal and interest on equipment trust certificates, bonded or other indebtedness, or any amounts in accomplishment of a defeasance of any outstanding revenue bond indenture.