35 Pa. Stat. § 1680.505a
In the discretion of the agency, bonds and notes issued by it shall be secured by a trust agreement by and between the agency and a trustee, which may be any trust company or bank within the Commonwealth having the powers of a trust company. Either the resolution providing for the issuance of bonds and notes or such trust agreement may contain such provisions for protecting and enforcing the rights and remedies of the bondholders as may be reasonable and proper and not in violation of law, including covenants setting forth the duties of the agency in relation to the custody, safeguarding and application of all moneys.
It shall be lawful for any bank or trust company incorporated under the laws of the Commonwealth to act as depository of the proceeds of bonds and notes or of revenues and to furnish such indemnifying bonds or to pledge such securities as may be required by the agency. Such trust agreement may set forth the rights and remedies of the bondholders and noteholders and of the trustee, and may restrict the individual right of action by bondholders and noteholders. In addition to the foregoing, such trust agreement may contain such other provision as the agency may deem reasonable and proper for the security of the bondholders and noteholders. All expenses incurred in carrying out the provisions of such trust agreement may be treated as a part of the cost of the operation of the agency.
35 P.S. § 1680.505a