Notwithstanding Section 30638, all net income from fees, charges, rents, profits, or other net income arising from joint development of the property of the district which was acquired exclusively for the rail rapid transit system shall be used only for the following purposes:

1. (a) Pay the capital and operating expenses of the rail rapid transit system.
2. (b) Provide for the payment of interest and principal of the bonded debt for the rail rapid transit system, subject to the applicable provisions of this part authorizing the issuance and retirement of bonds.

3. (c) Provide for the payment of contracts, agreements, leases, equipment, and other legal liabilities assumed under Chapter 8 (commencing with Section 31000).

   As used in this section, “operating expenses” includes the expenses of operation, maintenance, and repair of all personal or real property physically or functionally related to rail rapid transit services or facilities.