An ordinance authorizing the issuance of bonds under this Article may in the discretion of the township board provide that the bonds be secured by a trust agreement or depositary agreement by and between the board and a corporate trustee, which may be a trust company or a bank having powers of a trust company within this State. The agreement may contain provisions for directing and enforcing the rights and remedies of the bondholders deemed reasonable and proper, including the terms upon which the trustee and the bondholders, or either of them, may enforce their rights, but no trust agreement or depositary agreement shall convey, mortgage, or create any lien upon the properties constituting the system.
60 ILCS 1/205-25